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Shin SB, Woo SU, Chin YW, Jang YJ, Yim H. Sensitivity of TP53-Mutated Cancer Cells to the Phytoestrogen Genistein Is Associated With Direct Inhibition of Plk1 Activity. J Cell Physiol 2017; 232:2818-2828. [PMID: 27861885 DOI: 10.1002/jcp.25680] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Accepted: 11/07/2016] [Indexed: 11/09/2022]
Abstract
Polo-like kinase 1 (Plk1), a conserved Ser/Thr mitotic kinase, has been identified as a promising target for anticancer drug development because its overexpression is correlated with malignancy. Here, we found that genistein, an isoflavone, inhibits Plk1 kinase activity directly. Previously the mitotic disturbance phenomenon induced by treatment with genistein was not fully explained by its inhibitory effect on EGFR. In kinase profiling assays, it showed selectivity relative to a panel of kinases, including EGFR. Treatment with genistein induced cell death in a concentration-dependent manner in cancer cells from diverse tissue origins, but not in non-transformed cells such as hTERT-RPE or MCF10A cells. We also observed that genistein tended to be more selective against cancer cells with mutations in the TP53 gene. TP53-depeleted LNCaP and NCI-H460 cells using shRNA targeting human TP53 were more sensitive to cell death by treatment of genistein. Furthermore, genistein induced mitotic arrest by inhibiting Plk1 activity and, consequently, led to mitotic catastrophe and apoptosis. These data suggest that genistein may be a promising anticancer drug candidate due to its inhibitory activity against Plk1 as well as EGFR and effectiveness toward cancer cells, especially those with p53-mutation. J. Cell. Physiol. 232: 2818-2828, 2017. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Sol-Bi Shin
- Department of Pharmacy, College of Pharmacy, Institute of Pharmaceutical Science and Technology, Hanyang University, Ansan, Gyeonggi-do, Korea
| | - Sang-Uk Woo
- Department of Pharmacy, College of Pharmacy, Institute of Pharmaceutical Science and Technology, Hanyang University, Ansan, Gyeonggi-do, Korea
| | - Young-Won Chin
- College of Pharmacy and Integrated Research Institute for Drug Development, Dongguk University-Seoul, Goyang, Gyeonggi-do, Korea
| | - Young-Joo Jang
- Department of Nanobiomedical Science and BK21 PLUS Global Research Center for Regenerative Medicine, Dankook University, Cheonan, Korea
| | - Hyungshin Yim
- Department of Pharmacy, College of Pharmacy, Institute of Pharmaceutical Science and Technology, Hanyang University, Ansan, Gyeonggi-do, Korea
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52
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Kolosenko I, Edsbäcker E, Björklund AC, Hamil AS, Goroshchuk O, Grandér D, Dowdy SF, Palm-Apergi C. RNAi prodrugs targeting Plk1 induce specific gene silencing in primary cells from pediatric T-acute lymphoblastic leukemia patients. J Control Release 2017; 261:199-206. [PMID: 28684168 DOI: 10.1016/j.jconrel.2017.07.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2017] [Revised: 06/29/2017] [Accepted: 07/01/2017] [Indexed: 12/14/2022]
Abstract
Epidemiological studies of childhood leukemia survivors reveal an alarmingly high incidence of chronic health disabilities after treatment, therefore, more specific therapies need to be developed. Polo-like kinase 1 (Plk1) is a key player in mitosis and a target for drug development as it is upregulated in multiple cancer types. Small molecules targeting Plk1 are mainly ATP-competitors and, therefore, are known to elicit side effects due to lack of specificity. RNA interference (RNAi) is known for its high catalytic activity and target selectivity; however, the biggest barrier for its introduction into clinical use is its delivery. RNAi prodrugs are modified, self-delivering short interfering Ribonucleic Neutrals (siRNNs), cleaved by cytoplasmic enzymes into short interfering Ribonucleic Acids (siRNAs) once inside cells. In this study we aimed to investigate the potential of siRNNs as therapeutic tools in T-acute lymphoblastic leukemia (T-ALL) using T-ALL cell lines and patient-derived samples. We demonstrate for the first time that RNAi prodrugs (siRNNs) targeting Plk1, can enter pediatric T-ALL patient cells without a transfection reagent and induce Plk1 knockdown on both protein and mRNA levels resulting in G2/M-arrest and apoptosis. We also show that siRNNs targeting Plk1 generate less toxicity in normal cells compared to the small molecule Plk1 inhibitor, BI6727, suggesting a potentially good therapeutic index.
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Affiliation(s)
- Iryna Kolosenko
- Department of Oncology-Pathology, Cancer Center Karolinska, Karolinska Institutet, Sweden; Department of Laboratory Medicine, Clinical Research Center, Karolinska Institutet, Sweden
| | - Elin Edsbäcker
- Department of Oncology-Pathology, Cancer Center Karolinska, Karolinska Institutet, Sweden; Department of Laboratory Medicine, Clinical Research Center, Karolinska Institutet, Sweden
| | - Ann-Charlotte Björklund
- Department of Oncology-Pathology, Cancer Center Karolinska, Karolinska Institutet, Sweden; Department of Laboratory Medicine, Clinical Research Center, Karolinska Institutet, Sweden
| | - Alexander S Hamil
- Department of Cellular & Molecular Medicine, UCSD School of Medicine, La Jolla, California, USA
| | - Oksana Goroshchuk
- Department of Laboratory Medicine, Clinical Research Center, Karolinska Institutet, Sweden
| | - Dan Grandér
- Department of Oncology-Pathology, Cancer Center Karolinska, Karolinska Institutet, Sweden
| | - Steven F Dowdy
- Department of Cellular & Molecular Medicine, UCSD School of Medicine, La Jolla, California, USA
| | - Caroline Palm-Apergi
- Department of Oncology-Pathology, Cancer Center Karolinska, Karolinska Institutet, Sweden; Department of Laboratory Medicine, Clinical Research Center, Karolinska Institutet, Sweden.
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53
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Wright G, Golubeva V, Remsing Rix LL, Berndt N, Luo Y, Ward GA, Gray JE, Schonbrunn E, Lawrence HR, Monteiro AN, Rix U. Dual Targeting of WEE1 and PLK1 by AZD1775 Elicits Single Agent Cellular Anticancer Activity. ACS Chem Biol 2017; 12:1883-1892. [PMID: 28557434 PMCID: PMC5551971 DOI: 10.1021/acschembio.7b00147] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Inhibition of the WEE1 tyrosine kinase enhances anticancer chemotherapy efficacy. Accordingly, the WEE1 inhibitor AZD1775 (previously MK-1775) is currently under evaluation in clinical trials for cancer in combination with chemotherapy. AZD1775 has been reported to display high selectivity and is therefore used in many studies as a probe to interrogate WEE1 biology. However, AZD1775 also exhibits anticancer activity as a single agent although the underlying mechanism is not fully understood. Using a chemical proteomics approach, we here describe a proteome-wide survey of AZD1775 targets in lung cancer cells and identify several previously unknown targets in addition to WEE1. In particular, we observed polo-like kinase 1 (PLK1) as a new target of AZD1775. Importantly, in vitro kinase assays showed PLK1 and WEE1 to be inhibited by AZD1775 with similar potency. Subsequent loss-of-function experiments using RNAi for WEE1 and PLK1 suggested that targeting PLK1 enhances the pro-apoptotic and antiproliferative effects observed with WEE1 knockdown. Combination of RNAi with AZD1775 treatment suggested WEE1 and PLK1 to be the most relevant targets for mediating AZD1775's anticancer effects. Furthermore, disruption of WEE1 by CRISPR-Cas9 sensitized H322 lung cancer cells to AZD1775 to a similar extent as the potent PLK1 inhibitor BI-2536 suggesting a complex crosstalk between PLK1 and WEE1. In summary, we show that AZD1775 is a potent dual WEE1 and PLK1 inhibitor, which limits its use as a specific molecular probe for WEE1. However, PLK1 inhibition makes important contributions to the single agent mechanism of action of AZD1775 and enhances its anticancer effects.
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Affiliation(s)
- Gabriela Wright
- Drug Discovery Department, H. Lee Moffitt Cancer Center & Research Institute, Tampa, FL
| | - Volha Golubeva
- Cancer Epidemiology, H. Lee Moffitt Cancer Center & Research Institute, Tampa, FL
| | - Lily L. Remsing Rix
- Drug Discovery Department, H. Lee Moffitt Cancer Center & Research Institute, Tampa, FL
| | - Norbert Berndt
- Drug Discovery Department, H. Lee Moffitt Cancer Center & Research Institute, Tampa, FL
| | - Yunting Luo
- Chemical Biology Core, H. Lee Moffitt Cancer Center & Research Institute, Tampa, FL
| | - Grace A. Ward
- Drug Discovery Department, H. Lee Moffitt Cancer Center & Research Institute, Tampa, FL
- Cancer Biology PhD Program, University of South Florida, Tampa, FL
| | - Jhanelle E. Gray
- Thoracic Oncology Department, H. Lee Moffitt Cancer Center & Research Institute, Tampa, FL
| | - Ernst Schonbrunn
- Drug Discovery Department, H. Lee Moffitt Cancer Center & Research Institute, Tampa, FL
- Chemical Biology Core, H. Lee Moffitt Cancer Center & Research Institute, Tampa, FL
| | - Harshani R. Lawrence
- Drug Discovery Department, H. Lee Moffitt Cancer Center & Research Institute, Tampa, FL
- Chemical Biology Core, H. Lee Moffitt Cancer Center & Research Institute, Tampa, FL
| | - Alvaro N.A. Monteiro
- Cancer Epidemiology, H. Lee Moffitt Cancer Center & Research Institute, Tampa, FL
| | - Uwe Rix
- Drug Discovery Department, H. Lee Moffitt Cancer Center & Research Institute, Tampa, FL
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54
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Archambault V, Normandin K. Several inhibitors of the Plk1 Polo-Box Domain turn out to be non-specific protein alkylators. Cell Cycle 2017; 16:1220-1224. [PMID: 28521657 PMCID: PMC5499904 DOI: 10.1080/15384101.2017.1325043] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 04/18/2017] [Accepted: 04/24/2017] [Indexed: 12/16/2022] Open
Abstract
For almost a decade, there has been much interest in the development of chemical inhibitors of Polo-like kinase 1 (Plk1) protein interactions. Plk1 is a master regulator of the cell division cycle that controls numerous substrates. It is a promising target for cancer drug development. Inhibitors of the kinase domain of Plk1 had some success in clinical trials. However, they are not perfectly selective. In principle, Plk1 can also be inhibited by interfering with its protein interaction domain, the Polo-Box Domain (PBD). Selective chemical inhibitors of the PBD would constitute tools to probe for PBD-dependent functions of Plk1 and could be advantageous in cancer therapy. The discovery of Poloxin and thymoquinone as PBD inhibitors indicated that small, cell-permeable chemical inhibitors could be identified. Other efforts followed, including ours, reporting additional molecules capable of blocking the PBD. It is now clear that, unfortunately, most of these compounds are non-specific protein alkylators (defined here as groups covalently added via a carbon) that have little or no potential for the development of real Plk1 PBD-specific drugs. This situation should be minded by biologists potentially interested in using these compounds to study Plk1. Further efforts are needed to develop selective, cell-permeable PBD inhibitors.
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Affiliation(s)
- Vincent Archambault
- Institute for Research in Immunology and Cancer, Université de Montréal, Montreal, Canada
- Département de biochimie et médecine moléculaire, Université de Montréal, Montreal, Canada
| | - Karine Normandin
- Institute for Research in Immunology and Cancer, Université de Montréal, Montreal, Canada
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55
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Kumar S, Sharma G, Chakraborty C, Sharma AR, Kim J. Regulatory functional territory of PLK-1 and their substrates beyond mitosis. Oncotarget 2017; 8:37942-37962. [PMID: 28415805 PMCID: PMC5514964 DOI: 10.18632/oncotarget.16290] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Accepted: 03/03/2017] [Indexed: 12/04/2022] Open
Abstract
Polo-like kinase 1 (PLK-1) is a well-known (Ser/Thr) mitotic protein kinase and is considered as a proto-oncogene. As hyper-activation of PLK-1 is broadly associated with poor prognosis and cancer progression, it is one of the most extensively studied mitotic kinases. During mitosis, PLK-1 regulates various cell cycle events, such as spindle pole maturation, chromosome segregation and cytokinesis. However, studies have demonstrated that the role of PLK-1 is not only restricted to mitosis, but PLK-1 can also regulate other vital events beyond mitosis, including transcription, translation, ciliogenesis, checkpoint adaptation and recovery, apoptosis, chromosomes dynamics etc. Recent reviews have tried to define the regulatory role of PLK-1 during mitosis progression and tumorigenesis, but its' functional role beyond mitosis is still largely unexplored. PLK-1 can regulate the activity of many proteins that work outside of its conventional territory. The dysregulation of these proteins can cause diseases such as Alzheimer's disease, tumorigenesis etc. and may also lead to drug resistance. Thus, in this review, we discussed the versatile role of PLK-1 and tried to collect data to validate its' functional role in cell cycle regulation apart from mitosis.
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Affiliation(s)
- Shiv Kumar
- Department of Biochemistry, Institute of Cell Differentiation and Aging, Hallym University, College of Medicine, Chucheonsi, Gangwondo, Republic of Korea
| | - Garima Sharma
- Institute For Skeletal Aging & Orthopedic Surgery, Hallym University, College of Medicine, Chucheonsi, Gangwondo, Republic of Korea
| | - Chiranjib Chakraborty
- Department of Bio-informatics, School of Computer and Information Sciences, Galgotias University, Greater Noida, Uttar Pradesh, India
| | - Ashish Ranjan Sharma
- Institute For Skeletal Aging & Orthopedic Surgery, Hallym University, College of Medicine, Chucheonsi, Gangwondo, Republic of Korea
| | - Jaebong Kim
- Department of Biochemistry, Institute of Cell Differentiation and Aging, Hallym University, College of Medicine, Chucheonsi, Gangwondo, Republic of Korea
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56
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Gheghiani L, Loew D, Lombard B, Mansfeld J, Gavet O. PLK1 Activation in Late G2 Sets Up Commitment to Mitosis. Cell Rep 2017; 19:2060-2073. [PMID: 28591578 DOI: 10.1016/j.celrep.2017.05.031] [Citation(s) in RCA: 129] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Revised: 04/08/2017] [Accepted: 05/09/2017] [Indexed: 11/15/2022] Open
Abstract
Commitment to mitosis must be tightly coordinated with DNA replication to preserve genome integrity. While we have previously established that the timely activation of CyclinB1-Cdk1 in late G2 triggers mitotic entry, the upstream regulatory mechanisms remain unclear. Here, we report that Polo-like kinase 1 (Plk1) is required for entry into mitosis during an unperturbed cell cycle and is rapidly activated shortly before CyclinB1-Cdk1. We determine that Plk1 associates with the Cdc25C1 phosphatase and induces its phosphorylation before mitotic entry. Plk1-dependent Cdc25C1 phosphosites are sufficient to promote mitotic entry, even when Plk1 activity is inhibited. Furthermore, we find that activation of Plk1 during G2 relies on CyclinA2-Cdk activity levels. Our findings thus elucidate a critical role for Plk1 in CyclinB1-Cdk1 activation and mitotic entry and outline how CyclinA2-Cdk, an S-promoting factor, poises cells for commitment to mitosis.
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Affiliation(s)
- Lilia Gheghiani
- Sorbonne Universités, UPMC University Paris 06, UFR927, 75005 Paris, France; CNRS UMR 8200, 94805 Villejuif, France; Gustave Roussy Cancer Campus, 94805 Villejuif, France
| | - Damarys Loew
- Institut Curie, PSL Research University, LSMP, 75248 Paris, France
| | | | - Jörg Mansfeld
- Cell Cycle, Biotechnology Center, Technische Universität Dresden, 01307 Dresden, Germany
| | - Olivier Gavet
- Sorbonne Universités, UPMC University Paris 06, UFR927, 75005 Paris, France; CNRS UMR 8200, 94805 Villejuif, France; Gustave Roussy Cancer Campus, 94805 Villejuif, France.
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57
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Nguyen T, Parker R, Hawkins E, Holkova B, Yazbeck V, Kolluri A, Kmieciak M, Rahmani M, Grant S. Synergistic interactions between PLK1 and HDAC inhibitors in non-Hodgkin's lymphoma cells occur in vitro and in vivo and proceed through multiple mechanisms. Oncotarget 2017; 8:31478-31493. [PMID: 28416758 PMCID: PMC5458223 DOI: 10.18632/oncotarget.15649] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Accepted: 11/22/2016] [Indexed: 01/06/2023] Open
Abstract
Interactions between the polo-like kinase 1 (PLK1) inhibitor volasertib and the histone deacetylase inhibitor (HDACI) belinostat were examined in diffuse large B-cell lymphoma (DLBCL) and mantle cell lymphoma (MCL) cells in vitro and in vivo. Exposure of DLBCL cells to very low concentrations of volasertib in combination with belinostat synergistically increased cell death (apoptosis). Similar interactions occurred in GC-, ABC-, double-hit DLBCL cells, MCL cells, bortezomib-resistant cells and primary lymphoma cells. Co-exposure to volasertib/belinostat induced a marked increase in M-phase arrest, phospho-histone H3, mitotic errors, cell death in M-phase, and DNA damage. Belinostat diminished c-Myc mRNA and protein expression, an effect significantly enhanced by volasertib co-exposure. c-Myc knock-down increased DNA damage and cell death in response to volasertib, arguing that c-Myc down-regulation plays a functional role in the lethality of this regimen. Notably, PLK1 knock-down in DLBCL cells significantly increased belinostat-induced M-phase accumulation, phospho-histone H3, γH2AX, and cell death. Co-administration of volasertib and belinostat dramatically reduced tumor growth in an ABC-DLBCL flank model (U2932) and a systemic double-hit lymphoma model (OCI-Ly18), accompanied by a pronounced increase in survival without significant weight loss or other toxicities. Together, these findings indicate that PLK1/HDAC inhibition warrants attention as a therapeutic strategy in NHL.
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Affiliation(s)
- Tri Nguyen
- Division of Hematology/Oncology, Department of Internal Medicine, Virginia Commonwealth University and the Massey Cancer Center, Richmond, VA, USA
| | - Rebecca Parker
- Division of Hematology/Oncology, Department of Internal Medicine, Virginia Commonwealth University and the Massey Cancer Center, Richmond, VA, USA
| | - Elisa Hawkins
- Division of Hematology/Oncology, Department of Internal Medicine, Virginia Commonwealth University and the Massey Cancer Center, Richmond, VA, USA
| | - Beata Holkova
- Division of Hematology/Oncology, Department of Internal Medicine, Virginia Commonwealth University and the Massey Cancer Center, Richmond, VA, USA
| | - Victor Yazbeck
- Division of Hematology/Oncology, Department of Internal Medicine, Virginia Commonwealth University and the Massey Cancer Center, Richmond, VA, USA
| | - Akhil Kolluri
- Division of Hematology/Oncology, Department of Internal Medicine, Virginia Commonwealth University and the Massey Cancer Center, Richmond, VA, USA
| | - Maciej Kmieciak
- Massey Cancer Center, Virginia Commonwealth University Health Sciences Center, Richmond, VA, USA
| | - Mohamed Rahmani
- Division of Hematology/Oncology, Department of Internal Medicine, Virginia Commonwealth University and the Massey Cancer Center, Richmond, VA, USA
| | - Steven Grant
- Division of Hematology/Oncology, Department of Internal Medicine, Virginia Commonwealth University and the Massey Cancer Center, Richmond, VA, USA
- Departments of Biochemistry, Virginia Commonwealth University, Richmond, VA, USA
- Departments of Pharmacology, Virginia Commonwealth University, Richmond, VA, USA
- Virginia Institute for Molecular Medicine, Virginia Commonwealth University, Richmond, VA, USA
- Massey Cancer Center, Virginia Commonwealth University Health Sciences Center, Richmond, VA, USA
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58
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Kiryanov A, Natala S, Jones B, McBride C, Feher V, Lam B, Liu Y, Honda K, Uchiyama N, Kawamoto T, Hikichi Y, Zhang L, Hosfield D, Skene R, Zou H, Stafford J, Cao X, Ichikawa T. Structure-based design and SAR development of 5,6-dihydroimidazolo[1,5-f]pteridine derivatives as novel Polo-like kinase-1 inhibitors. Bioorg Med Chem Lett 2017; 27:1311-1315. [PMID: 28169164 DOI: 10.1016/j.bmcl.2016.10.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Revised: 10/04/2016] [Accepted: 10/05/2016] [Indexed: 11/23/2022]
Abstract
Using structure-based drug design, we identified a novel series of 5,6-dihydroimidazolo[1,5-f]pteridine PLK1 inhibitors. Rational improvements to compounds of this class resulted in single-digit nanomolar enzyme and cellular activity against PLK1, and oral bioavailability. Compound 1 exhibits >7 fold induction of phosphorylated Histone H3 and is efficacious in an in vivo HT-29 tumor xenograft model.
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Affiliation(s)
- Andre Kiryanov
- Takeda California, 10410 Science Center Drive, San Diego 92121, USA.
| | - Srinivasa Natala
- Takeda California, 10410 Science Center Drive, San Diego 92121, USA
| | - Benjamin Jones
- Takeda California, 10410 Science Center Drive, San Diego 92121, USA
| | | | - Victoria Feher
- Takeda California, 10410 Science Center Drive, San Diego 92121, USA
| | - Betty Lam
- Takeda California, 10410 Science Center Drive, San Diego 92121, USA
| | - Yan Liu
- Takeda California, 10410 Science Center Drive, San Diego 92121, USA
| | - Kouhei Honda
- Takeda Pharmaceutical Company, Ltd, 2-26-1, Muraokahigashi, Fujisawa, Kanagawa 251-855, Japan
| | - Noriko Uchiyama
- Takeda Pharmaceutical Company, Ltd, 2-26-1, Muraokahigashi, Fujisawa, Kanagawa 251-855, Japan
| | - Tomohiro Kawamoto
- Takeda Pharmaceutical Company, Ltd, 2-26-1, Muraokahigashi, Fujisawa, Kanagawa 251-855, Japan
| | - Yuichi Hikichi
- Takeda Pharmaceutical Company, Ltd, 2-26-1, Muraokahigashi, Fujisawa, Kanagawa 251-855, Japan
| | - Lilly Zhang
- Takeda California, 10410 Science Center Drive, San Diego 92121, USA
| | - David Hosfield
- Takeda California, 10410 Science Center Drive, San Diego 92121, USA
| | - Robert Skene
- Takeda California, 10410 Science Center Drive, San Diego 92121, USA
| | - Hua Zou
- Takeda California, 10410 Science Center Drive, San Diego 92121, USA
| | - Jeffrey Stafford
- Takeda California, 10410 Science Center Drive, San Diego 92121, USA
| | - Xiaodong Cao
- Takeda California, 10410 Science Center Drive, San Diego 92121, USA
| | - Takashi Ichikawa
- Takeda Pharmaceutical Company, Ltd, 2-26-1, Muraokahigashi, Fujisawa, Kanagawa 251-855, Japan
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59
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Yim H, Shin SB, Woo SU, Lee PCW, Erikson RL. Plk1-mediated stabilization of 53BP1 through USP7 regulates centrosome positioning to maintain bipolarity. Oncogene 2017; 36:966-978. [PMID: 27477698 DOI: 10.1038/onc.2016.263] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Revised: 06/04/2016] [Accepted: 06/16/2016] [Indexed: 12/22/2022]
Abstract
Although 53BP1 has been established well as a mediator in DNA damage response, its function in mitosis is not clearly understood. We found that 53BP1 is a mitotic-binding partner of the kinases Plk1 and AuroraA, and that the binding with Plk1 increases the stability of 53BP1 by accelerating its interaction with the deubiquitinase USP7. Depletion of 53BP1 induces mitotic defects such as chromosomal missegregation, misorientation of spindle poles and the generation of extra centrosomes, which is similar phenotype to USP7-knockdown cells. In addition, 53BP1 depletion reduces the levels of p53 and centromere protein F (CENPF), interacting proteins of 53BP1. These phenotypes induced by 53BP1 depletion were rescued by expression of wild-type or phosphomimic mutant 53BP1 but not by expression of a dephosphomimic mutant. We propose that phosphorylation of 53BP1 at S380 accelerates complex formation with USP7 and CENPF to regulate their stability, thus having a crucial role in proper centrosome positioning, chromosomal alignment, and centrosome number.
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Affiliation(s)
- H Yim
- Department of Pharmacy, College of Pharmacy, Institute of Pharmaceutical Science and Technology, Hanyang University, Ansan, Gyeonggi-do, Korea
- Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA, USA
| | - S-B Shin
- Department of Pharmacy, College of Pharmacy, Institute of Pharmaceutical Science and Technology, Hanyang University, Ansan, Gyeonggi-do, Korea
| | - S U Woo
- Department of Pharmacy, College of Pharmacy, Institute of Pharmaceutical Science and Technology, Hanyang University, Ansan, Gyeonggi-do, Korea
| | - P C-W Lee
- Department of Biomedical Sciences, Cell Dysfunction Research Center (CDRC), University of Ulsan College of Medicine, Seoul, Korea
| | - R L Erikson
- Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA, USA
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60
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Pajtler KW, Sadowski N, Ackermann S, Althoff K, Schönbeck K, Batzke K, Schäfers S, Odersky A, Heukamp L, Astrahantseff K, Künkele A, Deubzer HE, Schramm A, Sprüssel A, Thor T, Lindner S, Eggert A, Fischer M, Schulte JH. The GSK461364 PLK1 inhibitor exhibits strong antitumoral activity in preclinical neuroblastoma models. Oncotarget 2017; 8:6730-6741. [PMID: 28036269 PMCID: PMC5351666 DOI: 10.18632/oncotarget.14268] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2016] [Accepted: 11/30/2016] [Indexed: 01/18/2023] Open
Abstract
Polo-like kinase 1 (PLK1) is a serine/threonine kinase that promotes G2/M-phase transition, is expressed in elevated levels in high-risk neuroblastomas and correlates with unfavorable patient outcome. Recently, we and others have presented PLK1 as a potential drug target for neuroblastoma, and reported that the BI2536 PLK1 inhibitor showed antitumoral actvity in preclinical neuroblastoma models. Here we analyzed the effects of GSK461364, a competitive inhibitor for ATP binding to PLK1, on typical tumorigenic properties of preclinical in vitro and in vivo neuroblastoma models. GSK461364 treatment of neuroblastoma cell lines reduced cell viability and proliferative capacity, caused cell cycle arrest and massively induced apoptosis. These phenotypic consequences were induced by treatment in the low-dose nanomolar range, and were independent of MYCN copy number status. GSK461364 treatment strongly delayed established xenograft tumor growth in nude mice, and significantly increased survival time in the treatment group. These preclinical findings indicate PLK1 inhibitors may be effective for patients with high-risk or relapsed neuroblastomas with upregulated PLK1 and might be considered for entry into early phase clinical trials in pediatric patients.
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Affiliation(s)
- Kristian W Pajtler
- Department of Physiology, Medical School, Institute for Medical Sciences, Chonbuk National University, Jeonju, Republic of Korea
- Department of Pediatric Oncology, Hematology and Immunology, University Hospital, Heidelberg, Germany
- German Cancer Consortium (DKTK Core Center Heidelberg), Germany
| | - Natalie Sadowski
- Department of Pediatric Oncology and Hematology, University Children`s Hospital Essen, Essen, Germany
| | - Sandra Ackermann
- Department of Pediatric Oncology and Hematology, University Children's Hospital, and Center for Molecular Medicine Cologne (CMMC), Cologne, Germany
| | - Kristina Althoff
- Department of Pediatric Oncology and Hematology, University Children`s Hospital Essen, Essen, Germany
| | - Kerstin Schönbeck
- Department of Pediatric Oncology/Hematology, Charité-Universitätsmedizin Berlin, Germany
| | - Katharina Batzke
- Department of Pediatric Oncology and Hematology, University Children`s Hospital Essen, Essen, Germany
| | - Simon Schäfers
- Department of Pediatric Oncology and Hematology, University Children`s Hospital Essen, Essen, Germany
| | - Andrea Odersky
- Department of Pediatric Oncology and Hematology, University Children`s Hospital Essen, Essen, Germany
| | - Lukas Heukamp
- NEO New Oncology, Cologne, Germany
- Institute for Hematopathology, Hamburg, Germany
| | - Kathy Astrahantseff
- Department of Pediatric Oncology/Hematology, Charité-Universitätsmedizin Berlin, Germany
| | - Annette Künkele
- Department of Pediatric Oncology/Hematology, Charité-Universitätsmedizin Berlin, Germany
| | - Hedwig E Deubzer
- Department of Pediatric Oncology/Hematology, Charité-Universitätsmedizin Berlin, Germany
| | - Alexander Schramm
- Department of Pediatric Oncology and Hematology, University Children`s Hospital Essen, Essen, Germany
| | - Annika Sprüssel
- Department of Pediatric Oncology/Hematology, Charité-Universitätsmedizin Berlin, Germany
- Berlin Institute of Health (BIH), Germany
- German Cancer Consortium (DKTK Berlin), Germany
| | - Theresa Thor
- Department of Pediatric Oncology and Hematology, University Children`s Hospital Essen, Essen, Germany
- German Cancer Consortium (DKTK Essen), Germany
- Translational Neuro-Oncology, West German Cancer Center, University Hospital Essen, University Duisburg-Essen, Essen, Germany
| | - Sven Lindner
- Department of Pediatric Oncology and Hematology, University Children`s Hospital Essen, Essen, Germany
| | - Angelika Eggert
- Department of Pediatric Oncology/Hematology, Charité-Universitätsmedizin Berlin, Germany
- Berlin Institute of Health (BIH), Germany
- German Cancer Consortium (DKTK Berlin), Germany
| | - Matthias Fischer
- Department of Pediatric Oncology and Hematology, University Children's Hospital, and Center for Molecular Medicine Cologne (CMMC), Cologne, Germany
- Medical Faculty, University of Cologne, Cologne, Germany
| | - Johannes H Schulte
- Department of Pediatric Oncology/Hematology, Charité-Universitätsmedizin Berlin, Germany
- Berlin Institute of Health (BIH), Germany
- German Cancer Consortium (DKTK Berlin), Germany
- German Cancer Research Center (DKFZ), Heidelberg, Germany
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Caron D, Byrne DP, Thebault P, Soulet D, Landry CR, Eyers PA, Elowe S. Mitotic phosphotyrosine network analysis reveals that tyrosine phosphorylation regulates Polo-like kinase 1 (PLK1). Sci Signal 2016; 9:rs14. [PMID: 27965426 DOI: 10.1126/scisignal.aah3525] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Tyrosine phosphorylation is closely associated with cell proliferation. During the cell cycle, serine and threonine phosphorylation plays the leading role, and such phosphorylation events are most dynamic during the mitotic phase of the cell cycle. However, mitotic phosphotyrosine is not well characterized. Although a few functionally-relevant mitotic phosphotyrosine sites have been characterized, evidence suggests that this modification may be more prevalent than previously appreciated. Here, we examined tyrosine phosphorylation in mitotic human cells including those on spindle-associated proteins.? Database mining confirmed ~2000 mitotic phosphotyrosine sites, and network analysis revealed a number of subnetworks that were enriched in tyrosine-phosphorylated proteins, including components of the kinetochore or spindle and SRC family kinases. We identified Polo-like kinase 1 (PLK1), a major signaling hub in the spindle subnetwork, as phosphorylated at the conserved Tyr217 in the kinase domain. Substitution of Tyr217 with a phosphomimetic residue eliminated PLK1 activity in vitro and in cells. Further analysis showed that Tyr217 phosphorylation reduced the phosphorylation of Thr210 in the activation loop, a phosphorylation event necessary for PLK1 activity. Our data indicate that mitotic tyrosine phosphorylation regulated a key serine/threonine kinase hub in mitotic cells and suggested that spatially separating tyrosine phosphorylation events can reveal previously unrecognized regulatory events and complexes associated with specific structures of the cell cycle.
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Affiliation(s)
- Danielle Caron
- Department of Pediatrics, Faculty of Medicine, Université Laval, Centre Hospitalier Universitaire de Québec Research Center, Quebec City, Quebec G1V 4G2, Canada
| | - Dominic P Byrne
- Department of Biochemistry, Institute of Integrative Biology, University of Liverpool, Liverpool L69 7ZB, U.K
| | - Philippe Thebault
- Department of Pediatrics, Faculty of Medicine, Université Laval, Centre Hospitalier Universitaire de Québec Research Center, Quebec City, Quebec G1V 4G2, Canada
| | - Denis Soulet
- Department of Psychiatry et Neurosciences, Faculty of Medicine, Université Laval, Centre Hospitalier Universitaire de Québec Research Center, Quebec City, Quebec G1V 4G2, Canada
| | - Christian R Landry
- Institut de Biologie Intégrative et des Systèmes, Department of Biology, PROTEO, Université Laval, Pavillon Charles-Eugène-Marchand, 1030 Avenue de la Médecine, Quebec City, Quebec G1V 0A6, Canada
| | - Patrick A Eyers
- Department of Biochemistry, Institute of Integrative Biology, University of Liverpool, Liverpool L69 7ZB, U.K
| | - Sabine Elowe
- Department of Pediatrics, Faculty of Medicine, Université Laval, Centre Hospitalier Universitaire de Québec Research Center, Quebec City, Quebec G1V 4G2, Canada.
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62
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Normandin K, Lavallée JF, Futter M, Beautrait A, Duchaine J, Guiral S, Marinier A, Archambault V. Identification of Polo-like kinase 1 interaction inhibitors using a novel cell-based assay. Sci Rep 2016; 5:37581. [PMID: 27874094 PMCID: PMC5118709 DOI: 10.1038/srep37581] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Accepted: 10/31/2016] [Indexed: 02/08/2023] Open
Abstract
Polo-like kinase 1 (Plk1) plays several roles in cell division and it is a recognized cancer drug target. Plk1 levels are elevated in cancer and several types of cancer cells are hypersensitive to Plk1 inhibition. Small molecule inhibitors of the kinase domain (KD) of Plk1 have been developed. Their selectivity is limited, which likely contributes to their toxicity. Polo-like kinases are characterized by a Polo-Box Domain (PBD), which mediates interactions with phosphorylation substrates or regulators. Inhibition of the PBD could allow better selectivity or result in different effects than inhibition of the KD. In vitro screens have been used to identify PBD inhibitors with mixed results. We developed the first cell-based assay to screen for PBD inhibitors, using Bioluminescence Resonance Energy Transfer (BRET). We screened through 112 983 compounds and characterized hits in secondary biochemical and biological assays. Subsequent Structure-Activity Relationship (SAR) analysis on our most promising hit revealed that it requires an alkylating function for its activity. In addition, we show that the previously reported PBD inhibitors thymoquinone and Poloxin are also alkylating agents. Our cell-based assay is a promising tool for the identification of new PBD inhibitors with more drug-like profiles using larger and more diverse chemical libraries.
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Affiliation(s)
- Karine Normandin
- Institute for Research in Immunology and Cancer, Université de Montréal, Montréal, Canada
| | - Jean-François Lavallée
- Institute for Research in Immunology and Cancer, Université de Montréal, Montréal, Canada
| | - Marie Futter
- Institute for Research in Immunology and Cancer, Université de Montréal, Montréal, Canada
| | - Alexandre Beautrait
- Institute for Research in Immunology and Cancer, Université de Montréal, Montréal, Canada
| | - Jean Duchaine
- Institute for Research in Immunology and Cancer, Université de Montréal, Montréal, Canada
| | - Sébastien Guiral
- Institute for Research in Immunology and Cancer, Université de Montréal, Montréal, Canada
| | - Anne Marinier
- Institute for Research in Immunology and Cancer, Université de Montréal, Montréal, Canada
- Département de chimie, Université de Montréal, Montréal, Canada
| | - Vincent Archambault
- Institute for Research in Immunology and Cancer, Université de Montréal, Montréal, Canada
- Département de biochimie et médecine moléculaire, Université de Montréal, Montréal, Canada
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Yamamoto VN, Thylur DS, Bauschard M, Schmale I, Sinha UK. Overcoming radioresistance in head and neck squamous cell carcinoma. Oral Oncol 2016; 63:44-51. [PMID: 27938999 DOI: 10.1016/j.oraloncology.2016.11.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Revised: 08/29/2016] [Accepted: 11/06/2016] [Indexed: 12/28/2022]
Abstract
Radiation therapy plays an essential role in the treatment of head and neck squamous cell carcinoma (HNSCC), yet therapeutic efficacy is hindered by treatment-associated toxicity and tumor recurrence. In comparison to other cancers, innovation has proved challenging, with the epidermal growth factor receptor (EGFR) antibody cetuximab being the only new radiosensitizing agent approved by the FDA in over half a century. This review examines the physiological mechanisms that contribute to radioresistance in HNSCC as well as preclinical and clinical data regarding novel radiosensitizing agents, with an emphasis on those with highest translational promise.
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Affiliation(s)
- Vicky N Yamamoto
- USC Tina and Rick Caruso Department of Otolaryngology-Head & Neck Surgery, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States.
| | - David S Thylur
- USC Tina and Rick Caruso Department of Otolaryngology-Head & Neck Surgery, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Michael Bauschard
- USC Tina and Rick Caruso Department of Otolaryngology-Head & Neck Surgery, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Isaac Schmale
- Department of Otolaryngology-Head & Neck Surgery, University of Rochester Medical Center, Rochester, NY, United States
| | - Uttam K Sinha
- USC Tina and Rick Caruso Department of Otolaryngology-Head & Neck Surgery, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
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64
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Amani V, Prince EW, Alimova I, Balakrishnan I, Birks D, Donson AM, Harris P, Levy JMM, Handler M, Foreman NK, Venkataraman S, Vibhakar R. Polo-like Kinase 1 as a potential therapeutic target in Diffuse Intrinsic Pontine Glioma. BMC Cancer 2016; 16:647. [PMID: 27538997 PMCID: PMC4991074 DOI: 10.1186/s12885-016-2690-6] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Accepted: 08/08/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Diffuse intrinsic pontine gliomas (DIPGs) are highly aggressive, fatal, childhood tumors that arise in the brainstem. DIPGs have no effective treatment, and their location and diffuse nature render them inoperable. Radiation therapy remains the only standard of care for this devastating disease. New therapeutic targets are needed to develop novel therapy for DIPG. METHODS We examined the expression of PLK1 mRNA in DIPG tumor samples through microarray analysis and found it to be up regulated versus normal pons. Using the DIPG tumor cells, we inhibited PLK1 using a clinically relevant specific inhibitor BI 6727 and evaluated the effects on, proliferation, apoptosis, induction of DNA damage and radio sensitization of the DIPG tumor cells. RESULTS Treatment of DIPG cell lines with BI 6727, a new generation, highly selective inhibitor of PLK1, resulted in decreased cell proliferation and a marked increase in cellular apoptosis. Cell cycle analysis showed a significant arrest in G2-M phase and a substantial increase in cell death. Treatment also resulted in an increased γH2AX expression, indicating induction of DNA damage. PLK1 inhibition resulted in radiosensitization of DIPG cells. CONCLUSION These findings suggest that targeting PLK1 with small-molecule inhibitors, in combination with radiation therapy, will hold a novel strategy in the treatment of DIPG that warrants further investigation.
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Affiliation(s)
- Vladimir Amani
- Department of Pediatrics, University of Colorado Denver, Anschutz Medical Campus, 12800 19th Ave, Aurora, CO 80045 USA
| | - Eric W Prince
- Department of Pediatrics, University of Colorado Denver, Anschutz Medical Campus, 12800 19th Ave, Aurora, CO 80045 USA
| | - Irina Alimova
- Department of Pediatrics, University of Colorado Denver, Anschutz Medical Campus, 12800 19th Ave, Aurora, CO 80045 USA
| | - Ilango Balakrishnan
- Department of Pediatrics, University of Colorado Denver, Anschutz Medical Campus, 12800 19th Ave, Aurora, CO 80045 USA
| | - Diane Birks
- Department of Neurosurgery, University of Colorado, Anschutz Medical Campus, 12800 19th Ave, Aurora, CO 80045 USA
| | - Andrew M. Donson
- Department of Pediatrics, University of Colorado Denver, Anschutz Medical Campus, 12800 19th Ave, Aurora, CO 80045 USA
| | - Peter Harris
- Department of Pediatrics, University of Colorado Denver, Anschutz Medical Campus, 12800 19th Ave, Aurora, CO 80045 USA
| | - Jean M. Mulcahy Levy
- Department of Pediatrics, University of Colorado Denver, Anschutz Medical Campus, 12800 19th Ave, Aurora, CO 80045 USA
- Children’s Hospital Colorado, 13123 E 16th Ave, Aurora, CO 80045 USA
| | - Michael Handler
- Department of Neurosurgery, University of Colorado, Anschutz Medical Campus, 12800 19th Ave, Aurora, CO 80045 USA
- Children’s Hospital Colorado, 13123 E 16th Ave, Aurora, CO 80045 USA
| | - Nicholas K. Foreman
- Department of Pediatrics, University of Colorado Denver, Anschutz Medical Campus, 12800 19th Ave, Aurora, CO 80045 USA
- Department of Neurosurgery, University of Colorado, Anschutz Medical Campus, 12800 19th Ave, Aurora, CO 80045 USA
- Children’s Hospital Colorado, 13123 E 16th Ave, Aurora, CO 80045 USA
| | - Sujatha Venkataraman
- Department of Pediatrics, University of Colorado Denver, Anschutz Medical Campus, 12800 19th Ave, Aurora, CO 80045 USA
| | - Rajeev Vibhakar
- Department of Pediatrics, University of Colorado Denver, Anschutz Medical Campus, 12800 19th Ave, Aurora, CO 80045 USA
- Department of Neurosurgery, University of Colorado, Anschutz Medical Campus, 12800 19th Ave, Aurora, CO 80045 USA
- Children’s Hospital Colorado, 13123 E 16th Ave, Aurora, CO 80045 USA
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65
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Berges C, Chatterjee M, Topp MS, Einsele H. Targeting polo-like kinase 1 suppresses essential functions of alloreactive T cells. Immunol Res 2016; 64:687-98. [PMID: 26724940 DOI: 10.1007/s12026-015-8778-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Acute graft-versus-host disease (aGvHD) is still a major cause of transplant-related mortality after allogeneic stem cell transplantation (ASCT). It requires immunosuppressive treatments that broadly abrogate T cell responses including beneficial ones directed against tumor cells or infective pathogens. Polo-like kinase 1 (PLK1) is overexpressed in many cancer types including leukemia, and clinical studies demonstrated that targeting PLK1 using selective PLK1 inhibitors resulted in inhibition of proliferation and induction of apoptosis predominantly in tumor cells, supporting the feasibility of PLK1 as target for anticancer therapy. Here, we show that activation of alloreactive T cells (Tallo) up-regulate expression of PLK1, suggesting that PLK1 is a potential new candidate for dual therapy of aGvHD and leukemia after ASCT. Inhibition of PLK1, using PLK1-specific inhibitor GSK461364A selectively depletes Tallo by preventing activation and by inducing apoptosis in already activated Tallo, while memory T cells are preserved. Activated Tallo cells which survive exposure to PLK1 undergo inhibition of proliferation by induction of G2/M cell cycle arrest, which is accompanied by accumulation of cell cycle regulator proteins p21(WAF/CIP1), p27(Kip1), p53 and cyclin B1, whereas abundance of CDK4 decreased. We also show that suppressive effects of PLK1 inhibition on Tallo were synergistically enhanced by concomitant inhibition of molecular chaperone Hsp90. Taken together, our data suggest that PLK1 inhibition represents a reasonable dual strategy to suppress residual tumor growth and efficiently deplete Tallo, and thus provide a rationale to selectively prevent and treat aGvHD.
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Affiliation(s)
- Carsten Berges
- Division of Hematology and Oncology, Department of Internal Medicine II, University Hospital of Würzburg, Würzburg, Germany.
| | - Manik Chatterjee
- Division of Hematology and Oncology, Department of Internal Medicine II, University Hospital of Würzburg, Würzburg, Germany
- Comprehensive Cancer Center Mainfranken, University Hospital of Würzburg, Würzburg, Germany
| | - Max S Topp
- Division of Hematology and Oncology, Department of Internal Medicine II, University Hospital of Würzburg, Würzburg, Germany
| | - Hermann Einsele
- Division of Hematology and Oncology, Department of Internal Medicine II, University Hospital of Würzburg, Würzburg, Germany
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Kumar S, Sharma AR, Sharma G, Chakraborty C, Kim J. PLK-1: Angel or devil for cell cycle progression. BIOCHIMICA ET BIOPHYSICA ACTA 2016; 1865:190-203. [PMID: 26899266 DOI: 10.1016/j.bbcan.2016.02.003] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Revised: 02/01/2016] [Accepted: 02/16/2016] [Indexed: 12/31/2022]
Abstract
PLK-1 is a key player in the eukaryotic cell cycle. Cell cycle progression is precisely controlled by cell cycle regulatory kinases. PLK-1 is a mitotic kinase that actively regulates the G2/M transition, mitosis, mitotic exit, and cytokinesis. During cell cycle progression, PLK-1 controls various events related to the cell cycle maturation, directly and/or indirectly. On the contrary, aberrant expression of PLK-1 is strongly associated with tumorigenesis and its poor prognosis. The misexpression of PLK-1 causes the abnormalities including aneuploidy, mitotic defects, leading to tumorigenesis through inhibiting the p53 and pRB genes. Therefore, we reviewed the role of PLK-1 in the cell cycle progression and in the tumorigenesis either as a cell cycle regulator or on an attractive anti-cancer drug target.
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Affiliation(s)
- Shiv Kumar
- Department of Biochemistry, Institute of Cell Differentiation and Aging, Hallym University, College of Medicine, Chucheonsi, Gangwondo 200-704, Republic of Korea.
| | - Ashish Ranjan Sharma
- Institute For Skeletal Aging & Orthopedic Surgery, Hallym University, College of Medicine, Chucheonsi, Gangwondo 200-704, Republic of Korea.
| | - Garima Sharma
- Institute For Skeletal Aging & Orthopedic Surgery, Hallym University, College of Medicine, Chucheonsi, Gangwondo 200-704, Republic of Korea.
| | - Chiranjib Chakraborty
- Department of Bio-informatics, School of Computer and Information Sciences, Galgotias University, Greater Noida 203201, India.
| | - Jaebong Kim
- Department of Biochemistry, Institute of Cell Differentiation and Aging, Hallym University, College of Medicine, Chucheonsi, Gangwondo 200-704, Republic of Korea.
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67
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Lasek AL, McPherson BM, Trueman NG, Burkard ME. The Functional Significance of Posttranslational Modifications on Polo-Like Kinase 1 Revealed by Chemical Genetic Complementation. PLoS One 2016; 11:e0150225. [PMID: 26919439 PMCID: PMC4769148 DOI: 10.1371/journal.pone.0150225] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Accepted: 02/10/2016] [Indexed: 01/19/2023] Open
Abstract
Mitosis is coordinated by carefully controlled phosphorylation and ubiquitin-mediated proteolysis. Polo-like kinase 1 (Plk1) plays a central role in regulating mitosis and cytokinesis by phosphorylating target proteins. Yet, Plk1 is itself a target for posttranslational modification by phosphorylation and ubiquitination. We developed a chemical-genetic complementation assay to evaluate the functional significance of 34 posttranslational modifications (PTMs) on human Plk1. To do this, we used human cells that solely express a modified analog-sensitive Plk1 (Plk1AS) and complemented with wildtype Plk1. The wildtype Plk1 provides cells with a functional Plk1 allele in the presence of 3-MB-PP1, a bulky ATP-analog inhibitor that specifically inhibits Plk1AS. Using this approach, we evaluated the ability of 34 singly non-modifiable Plk1 mutants to complement Plk1AS in the presence of 3-MB-PP1. Mutation of the T-loop activating residue T210 and adjacent T214 are lethal, but surprisingly individual mutation of the remaining 32 posttranslational modification sites did not disrupt the essential functions of Plk1. To evaluate redundancy, we simultaneously mutated all phosphorylation sites in the kinase domain except for T210 and T214 or all sites in the C-terminal polo-box domain (PBD). We discovered that redundant phosphorylation events within the kinase domain are required for accurate chromosome segregation in anaphase but those in the PBD are dispensable. We conclude that PTMs within the T-loop of Plk1 are essential and nonredundant, additional modifications in the kinase domain provide redundant control of Plk1 function, and those in the PBD are dispensable for essential mitotic functions of Plk1. This comprehensive evaluation of Plk1 modifications demonstrates that although phosphorylation and ubiquitination are important for mitotic progression, many individual PTMs detected in human tissue may have redundant, subtle, or dispensable roles in gene function.
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Affiliation(s)
- Amber L. Lasek
- University of Wisconsin Carbone Cancer Center, University of Wisconsin-Madison, Madison, Wisconsin, 53705, United States of America
- Department of Medicine, Hematology/Oncology Division, University of Wisconsin-Madison, Madison, Wisconsin, 53705, United States of America
| | - Brittany M. McPherson
- University of Wisconsin Carbone Cancer Center, University of Wisconsin-Madison, Madison, Wisconsin, 53705, United States of America
- Department of Medicine, Hematology/Oncology Division, University of Wisconsin-Madison, Madison, Wisconsin, 53705, United States of America
| | - Natalie G. Trueman
- University of Wisconsin Carbone Cancer Center, University of Wisconsin-Madison, Madison, Wisconsin, 53705, United States of America
- Department of Medicine, Hematology/Oncology Division, University of Wisconsin-Madison, Madison, Wisconsin, 53705, United States of America
| | - Mark E. Burkard
- University of Wisconsin Carbone Cancer Center, University of Wisconsin-Madison, Madison, Wisconsin, 53705, United States of America
- Department of Medicine, Hematology/Oncology Division, University of Wisconsin-Madison, Madison, Wisconsin, 53705, United States of America
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Shi L, Yu B, Cai CH, Huang W, Zheng BJ, Smith DK, Huang JD. Combined prokaryotic-eukaryotic delivery and expression of therapeutic factors through a primed autocatalytic positive-feedback loop. J Control Release 2016; 222:130-40. [PMID: 26682504 DOI: 10.1016/j.jconrel.2015.12.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Revised: 11/16/2015] [Accepted: 12/06/2015] [Indexed: 01/04/2023]
Abstract
Progress in bacterial therapy for cancer and infectious diseases is hampered by the absence of safe and efficient vectors. Sustained delivery and high gene expression levels are critical for the therapeutic efficacy. Here we developed a Salmonella typhimrium strain to maintain and safely deliver a plasmid vector to target tissues. This vector is designed to allow dual transcription of therapeutic factors, such as cytotoxic proteins, short hairpin RNAs or combinations, in the nucleus or cytoplasm of eukaryotic cells, with this expression sustained by an autocatalytic positive-feedback loop. Mechanisms to prime the system and maintain the plasmid in the bacterium are also provided. Synergistic effects of attenuated Salmonella and our inter-kingdom system allow the precise expression of Diphtheria toxin A chain (DTA) gene in tumor microenvironment and eradicate large established tumors in immunocompetent animals. In the experiments reported here, 26% of mice (n=5/19) with aggressive tumors were cured and the others all survived until the end of the experiment. We also demonstrated that ST4 packaged with shRNA-encoding plasmids has sustained knockdown effects in nude mice bearing human MDA-MB-231 xenografts. Three weeks after injection of 5×10(6) ST4/pIKT-shPlk, PLK1 transcript levels in tumors were 62.5±18.6% lower than the vector control group (P=0.015). The presence of PLK1 5' RACE-PCR cleavage products confirmed a sustained RNAi-mediated mechanism of action. This innovative technology provides an effective and versatile vehicle for efficient inter-kingdom gene delivery that can be applied to cancer therapy and other purposes.
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Affiliation(s)
- Lei Shi
- School of Biomedical Sciences, The University of Hong Kong, Pokfulam, 999077, Hong Kong; Shenzhen Institute of Research and Innovation, The University of Hong Kong, Pokfulam, 999077, Hong Kong
| | - Bin Yu
- School of Biomedical Sciences, The University of Hong Kong, Pokfulam, 999077, Hong Kong; Shenzhen Institute of Research and Innovation, The University of Hong Kong, Pokfulam, 999077, Hong Kong; Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, PR China
| | - Chun-Hui Cai
- Department of Obstetrics and Gynaecology, The University of Hong Kong, Pokfulam, 999077, Hong Kong; Advanced Institute of Translational Medicine, Tongji University School of Medicine, Shanghai 200092, PR China
| | - Wei Huang
- Faculty of Biology, South University of Science and Technology of China, Shenzhen 518055, PR China
| | - Bo-Jian Zheng
- Department of Microbiology, The University of Hong Kong, Pokfulam, 999077, Hong Kong
| | - David Keith Smith
- School of Public Health, The University of Hong Kong, Pokfulam, 999077, Hong Kong
| | - Jian-Dong Huang
- School of Biomedical Sciences, The University of Hong Kong, Pokfulam, 999077, Hong Kong; Shenzhen Institute of Research and Innovation, The University of Hong Kong, Pokfulam, 999077, Hong Kong; The Centre for Synthetic Biology Engineering Research, Shenzhen Institutes of Advanced Technology, Shenzhen 518055, PR China.
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69
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Shafique S, Bibi N, Rashid S. In silico identification of putative bifunctional Plk1 inhibitors by integrative virtual screening and structural dynamics approach. J Theor Biol 2016; 388:72-84. [PMID: 26493360 DOI: 10.1016/j.jtbi.2015.10.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Revised: 09/14/2015] [Accepted: 10/10/2015] [Indexed: 12/31/2022]
Abstract
Polo like kinase (Plk1) is a master regulator of cell cycle and considered as next generation antimitotic target in human. As Plk1 predominantly expresses in the dividing cells with a much higher expression in cancerous cells, it serves as a discriminative target for cancer therapeutics. Here we implied a novel and promising integrative strategy to identify "bifunctional" Plk1 inhibitors that compete simultaneously with ATP and substrate for their binding sites. We integrated structure-based virtual screening (SBVS) and molecular dynamics simulations with emphasis on unique structural properties of Plk1. Through screening of 20,000 compounds, nearly ~2000 hits were enriched and subjected to SBVS against ATP and substrate binding sites of Plk1. Subsequently, on the basis of their binding abilities to Plk1 kinase and polo box domains, filtration of candidate hits resulted in the isolation of 26 compounds. By exclusion of close analogs or isomers, 10 unique compounds were selected for detailed study. A representative compound was subjected to molecular dynamics simulation assay to have deep structural insights and to gauge critical structural crunch for inhibitor binding against kinase and polo box domains. Our integrative approach may complement high-throughput screening and identify bifunctional Plk1 inhibitors that may contribute in selective targeting of Plk1 to elicit desired biological process.
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Affiliation(s)
- Shagufta Shafique
- National Center for Bioinformatics, Faculty of Biological Sciences, Quaid-i-Azam University Islamabad, Pakistan
| | - Nousheen Bibi
- National Center for Bioinformatics, Faculty of Biological Sciences, Quaid-i-Azam University Islamabad, Pakistan
| | - Sajid Rashid
- National Center for Bioinformatics, Faculty of Biological Sciences, Quaid-i-Azam University Islamabad, Pakistan.
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Li J, Wang R, Schweickert PG, Karki A, Yang Y, Kong Y, Ahmad N, Konieczny SF, Liu X. Plk1 inhibition enhances the efficacy of gemcitabine in human pancreatic cancer. Cell Cycle 2016; 15:711-9. [PMID: 26890815 PMCID: PMC4845940 DOI: 10.1080/15384101.2016.1148838] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Revised: 01/19/2016] [Accepted: 01/20/2016] [Indexed: 01/21/2023] Open
Abstract
Gemcitabine is the standard-of-care for chemotherapy in patients with pancreatic adenocarcinoma and it can directly incorporate into DNA or inhibit ribonucleotide reductase to prevent DNA replication and, thus, tumor cell growth. Most pancreatic tumors, however, develop resistance to gemcitabine. Polo-like kinase 1 (Plk1), a critical regulator in many cell cycle events, is significantly elevated in human pancreatic cancer. In this study, we show that Plk1 is required for the G1/S transition and that inhibition of Plk1 significantly reduces the DNA synthesis rate in human pancreatic cancer cells. Furthermore, the combined effect of a specific Plk1 inhibitor GSK461364A with gemcitabine was examined. We show that inhibition of Plk1 significantly potentiates the anti-neoplastic activity of gemcitabine in both cultured pancreatic cancer cells and Panc1-derived orthotopic pancreatic cancer xenograft tumors. Overall, our study demonstrates that co-targeting Plk1 can significantly enhance the efficacy of gemcitabine, offering a promising new therapeutic option for the treatment of gemcitabine-resistant human pancreatic cancer.
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Affiliation(s)
- Jie Li
- Department of Biochemistry, Purdue University, West Lafayette, IN, USA
| | - Ruixin Wang
- Department of Biochemistry, Purdue University, West Lafayette, IN, USA
| | | | - Anju Karki
- Department of Biological Science, Purdue University, West Lafayette, IN, USA
| | - Yi Yang
- Department of Biological Science, Purdue University, West Lafayette, IN, USA
| | - Yifan Kong
- Department of Biological Science, Purdue University, West Lafayette, IN, USA
| | - Nihal Ahmad
- Department of Dermatology, University of Wisconsin, Madison, WI, USA
| | - Stephen F. Konieczny
- Department of Biological Science, Purdue University, West Lafayette, IN, USA
- Center for Cancer Research, Purdue University, West Lafayette, IN, USA
| | - Xiaoqi Liu
- Department of Biochemistry, Purdue University, West Lafayette, IN, USA
- Center for Cancer Research, Purdue University, West Lafayette, IN, USA
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71
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Hugle M, Belz K, Fulda S. Identification of synthetic lethality of PLK1 inhibition and microtubule-destabilizing drugs. Cell Death Differ 2015; 22:1946-56. [PMID: 26024389 PMCID: PMC4816114 DOI: 10.1038/cdd.2015.59] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Revised: 04/07/2015] [Accepted: 04/08/2015] [Indexed: 12/21/2022] Open
Abstract
Polo-like kinase 1 (PLK1) is frequently overexpressed in cancer, which correlates with poor prognosis. Therefore, we investigated PLK1 as therapeutic target using rhabdomyosarcoma (RMS) as a model. Here, we identify a novel synthetic lethal interaction of PLK1 inhibitors and microtubule-destabilizing drugs in preclinical RMS models and elucidate the underlying molecular mechanisms of this synergism. PLK1 inhibitors (i.e., BI 2536 and BI 6727) synergistically induce apoptosis together with microtubule-destabilizing drugs (i.e., vincristine (VCR), vinblastine (VBL) and vinorelbine (VNR)) in several RMS cell lines (combination index <0.9) including a patient-derived primary RMS culture. Importantly, PLK1 inhibitors and VCR cooperate to significantly suppress RMS growth in two in vivo models, including a mouse xenograft model, without causing additive toxicity. In addition, no toxicity was observed in non-malignant fibroblast or myoblast cultures. Mechanistically, BI 2536/VCR co-treatment triggers mitotic arrest, which initiates mitochondrial apoptosis by inactivation of antiapoptotic BCL-2 family proteins, followed by BAX/BAK activation, production of reactive oxygen species (ROS) and activation of caspase-dependent or caspase-independent effector pathways. This conclusion is supported by data showing that BI 2536/VCR-induced apoptosis is significantly inhibited by preventing cells to enter mitosis, by overexpression of BCL-2 or a non-degradable MCL-1 mutant, by BAK knockdown, ROS scavengers, caspase inhibition or endonuclease G silencing. This identification of a novel synthetic lethality of PLK1 inhibitors and microtubule-destabilizing drugs has important implications for developing PLK1 inhibitor-based combination treatments.
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Affiliation(s)
- M Hugle
- Institute for Experimental Cancer Research in Pediatrics, Goethe-University, Frankfurt, Germany
| | - K Belz
- Institute for Experimental Cancer Research in Pediatrics, Goethe-University, Frankfurt, Germany
| | - S Fulda
- Institute for Experimental Cancer Research in Pediatrics, Goethe-University, Frankfurt, Germany
- German Cancer Consortium (DKTK), Heidelberg, Germany
- German Cancer Research Center (DKFZ), Heidelberg, Germany
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72
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Li J, Karki A, Hodges KB, Ahmad N, Zoubeidi A, Strebhardt K, Ratliff TL, Konieczny SF, Liu X. Cotargeting Polo-Like Kinase 1 and the Wnt/β-Catenin Signaling Pathway in Castration-Resistant Prostate Cancer. Mol Cell Biol 2015; 35:4185-98. [PMID: 26438599 PMCID: PMC4648817 DOI: 10.1128/mcb.00825-15] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Revised: 09/15/2015] [Accepted: 09/25/2015] [Indexed: 01/07/2023] Open
Abstract
The Wnt/β-catenin signaling pathway has been identified as one of the predominantly upregulated pathways in castration-resistant prostate cancer (CRPC). However, whether targeting the β-catenin pathway will prove effective as a CRPC treatment remains unknown. Polo-like kinase 1 (Plk1) is a critical regulator in many cell cycle events, and its level is significantly elevated upon castration of mice carrying xenograft prostate tumors. Indeed, inhibition of Plk1 has been shown to inhibit tumor growth in several in vivo studies. Here, we show that Plk1 is a negative regulator of Wnt/β-catenin signaling. Plk1 inhibition or depletion enhances the level of cytosolic and nuclear β-catenin in human prostate cancer cells. Furthermore, inhibition of Wnt/β-catenin signaling significantly potentiates the antineoplastic activity of the Plk1 inhibitor BI2536 in both cultured prostate cancer cells and CRPC xenograft tumors. Mechanistically, axin2, a negative regulator of the β-catenin pathway, serves as a substrate of Plk1, and Plk1 phosphorylation of axin2 facilitates the degradation of β-catenin by enhancing binding between glycogen synthase kinase 3β (GSK3β) and β-catenin. Plk1-phosphorylated axin2 also exhibits resistance to Cdc20-mediated degradation. Overall, this study identifies a novel Plk1-Wnt signaling axis in prostate cancer, offering a promising new therapeutic option to treat CRPC.
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Affiliation(s)
- Jie Li
- Department of Biochemistry, Purdue University, West Lafayette, Indiana, USA
| | - Anju Karki
- Department of Biological Science, Purdue University, West Lafayette, Indiana, USA
| | - Kurt B Hodges
- Department of Pathology and Laboratory Medicine, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Nihal Ahmad
- Department of Dermatology, University of Wisconsin, Madison, Madison, Wisconsin, USA
| | - Amina Zoubeidi
- The Vancouver Prostate Centre, Vancouver, British Columbia, Canada
| | - Klaus Strebhardt
- Department of Obstetrics and Gynecology, J. W. Goethe University, Frankfurt, Germany
| | - Timothy L Ratliff
- Center for Cancer Research, Purdue University, West Lafayette, Indiana, USA
| | - Stephen F Konieczny
- Department of Biological Science, Purdue University, West Lafayette, Indiana, USA Center for Cancer Research, Purdue University, West Lafayette, Indiana, USA
| | - Xiaoqi Liu
- Department of Biochemistry, Purdue University, West Lafayette, Indiana, USA Center for Cancer Research, Purdue University, West Lafayette, Indiana, USA
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73
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Lee KS, Burke TR, Park JE, Bang JK, Lee E. Recent Advances and New Strategies in Targeting Plk1 for Anticancer Therapy. Trends Pharmacol Sci 2015; 36:858-877. [PMID: 26478211 PMCID: PMC4684765 DOI: 10.1016/j.tips.2015.08.013] [Citation(s) in RCA: 87] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Revised: 08/21/2015] [Accepted: 08/21/2015] [Indexed: 12/11/2022]
Abstract
Polo-like kinase 1 (Plk1) plays key roles in regulating mitotic processes that are crucial for cellular proliferation. Overexpression of Plk1 is tightly associated with the development of particular cancers in humans, and a large body of evidence suggests that Plk1 is an attractive target for anticancer therapeutic development. Drugs targeting Plk1 can potentially be directed at two distinct sites: the N-terminal catalytic kinase domain (KD), which phosphorylates substrates, and the C-terminal polo-box domain (PBD) which is essential for protein-protein interactions. In this review we summarize recent advances and new challenges in the development of Plk1 inhibitors targeting these two domains. We also discuss novel strategies for designing and developing next-generation inhibitors to effectively treat Plk1-associated human disorders.
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Affiliation(s)
- Kyung S Lee
- Laboratory of Metabolism, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA.
| | - Terrence R Burke
- Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD 21702, USA
| | - Jung-Eun Park
- Laboratory of Metabolism, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Jeong K Bang
- Division of Magnetic Resonance, Korea Basic Science Institute, 804-1, Yangcheong Ri, Ochang, Chungbuk, Cheongwon 363-883, Republic of Korea
| | - Eunhye Lee
- Laboratory of Metabolism, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
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74
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Shin SB, Woo SU, Yim H. Differential Cellular Effects of Plk1 Inhibitors Targeting the ATP-binding Domain or Polo-box Domain. J Cell Physiol 2015; 230:3057-67. [PMID: 25975351 DOI: 10.1002/jcp.25042] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Accepted: 05/08/2015] [Indexed: 01/15/2023]
Abstract
The expression of polo-like kinase 1 (Plk1) correlates with malignancy and is thus recognized as a target for cancer therapy. In addition to the development of ATP-competitive Plk1 inhibitors, the polo-box domain (PBD), a unique functional domain of PLKs, is being targeted to develop Plk1-specific inhibitors. However, the action mechanisms of these two classes of Plk1 inhibitors have not been thoroughly evaluated. Here, we evaluate the differences in cellular effects of ATP-binding domain inhibitors (BI 2536, GSK 461364) and PBD inhibitors (poloxin, thymoquinone) to determine their mechanisms of Plk1 inhibition. Our data show that BI 2536 and GSK461364 increased the population of cells in the G2/M phase compared with controls, while treatment with poloxin and thymoquinone increased cell population in the S phase as well as in G2/M, in a p53-independent manner. The population of cells staining positively for p-Histone H3 and MPM2, mitotic index, was increased by treatment with BI 2536 or GSK461364, but not by treatment with poloxin or thymoquinone. Furthermore, treatment with BI 2536 or GSK461364 resulted in activation of the BubR1 spindle checkpoint kinase, suggesting that treatment with ATP-binding domain inhibitors induces metaphase arrest. However, the administration of poloxin and thymoquinone resulted in an increase in p21(WAF1) and S arrest, indicating that PBD inhibitors also affected interphase before mitotic entry. Taken together, these data suggest that the PDB of Plk1 plays a role in S phase progression through interaction with other proteins, while its ATP-binding domain is important for regulating mitotic progression mediated by its catalytic activity involving consumption of ATP.
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Affiliation(s)
- Sol-Bi Shin
- Department of Pharmacy, College of Pharmacy, Institute of Pharmaceutical Science and Technology, Hanyang University, Ansan, Gyeonggi-do, Korea
| | - Sang-Uk Woo
- Department of Pharmacy, College of Pharmacy, Institute of Pharmaceutical Science and Technology, Hanyang University, Ansan, Gyeonggi-do, Korea
| | - Hyungshin Yim
- Department of Pharmacy, College of Pharmacy, Institute of Pharmaceutical Science and Technology, Hanyang University, Ansan, Gyeonggi-do, Korea
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75
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Palmisiano ND, Kasner MT. Polo-like kinase and its inhibitors: Ready for the match to start? Am J Hematol 2015; 90:1071-6. [PMID: 26294255 DOI: 10.1002/ajh.24177] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2014] [Revised: 08/06/2015] [Accepted: 08/17/2015] [Indexed: 12/25/2022]
Abstract
Polo-like kinases (Plks) plays a central role in the normal cell cycle and their upregulation has been shown to play a role in the pathogenesis of multiple human cancers. Preclinical work demonstrates that targeting Plk has a significant impact on the treatment of both solid and hematologic malignancies in vitro and in vivo. We review here the basic science and clinical work to date with the Plks as well as future directions with this novel class of mitotic inhibitors.
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76
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Ellis PM, Leighl NB, Hirsh V, Reaume MN, Blais N, Wierzbicki R, Sadrolhefazi B, Gu Y, Liu D, Pilz K, Chu Q. A Randomized, Open-Label Phase II Trial of Volasertib as Monotherapy and in Combination With Standard-Dose Pemetrexed Compared With Pemetrexed Monotherapy in Second-Line Treatment for Non-Small-Cell Lung Cancer. Clin Lung Cancer 2015; 16:457-65. [PMID: 26100229 DOI: 10.1016/j.cllc.2015.05.010] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Revised: 05/19/2015] [Accepted: 05/26/2015] [Indexed: 11/27/2022]
Abstract
UNLABELLED Second-line therapy options that improve survival for patients with advanced non-small-cell lung cancer (NSCLC) are needed. This randomized, phase II trial (n [ 143) investigated volasertib monotherapy or in combination with pemetrexed compared with pemetrexed monotherapy in patients with NSCLC whose disease had progressed after previous platinum-based chemotherapy. The combination of volasertib with pemetrexed did not improve efficacy compared with pemetrexed monotherapy. INTRODUCTION Volasertib is a potent, selective, cell cycle kinase inhibitor that induces mitotic arrest and apoptosis by targeting Polo-like kinase. In this study we compared volasertib, volasertib with pemetrexed, and pemetrexed alone in patients with advanced non-small-cell lung cancer (NSCLC) whose disease progressed after first-line platinum-based chemotherapy. PATIENTS AND METHODS A run-in phase (n = 12) was used to determine whether volasertib could be combined in full dose with pemetrexed 500 mg/m(2). Subsequent patients were randomized to volasertib (n = 37), volasertib with pemetrexed (n = 47), or pemetrexed (n = 47) administered on day 1 every 21 days. The primary end point was progression-free survival (PFS); secondary end points included objective response rate and pharmacokinetics. RESULTS Volasertib 300 mg was chosen for the randomized phase. Recruitment to single-agent volasertib was stopped early because of lack of efficacy. Median PFS was 5.3 months with pemetrexed compared with 3.3 months with volasertib with pemetrexed (hazard ratio [HR], 1.141; 95% confidence interval [CI], 0.73-1.771) and 1.4 months with volasertib (HR, 2.045; 95% CI, 1.27-3.292). ORRs were 10.6% with pemetrexed, 21.3% for volasertib with pemetrexed, and 8.1% with volasertib. The most common all-grade related adverse events (pemetrexed/volasertib with pemetrexed/volasertib) were: fatigue (28 [61%]/27 [59%]/11 [31%]), nausea (21 [46%]/19 [41%]/0 [0%]), decreased apetite (14 [31%]/13 [28%]/2 [6%]), neutropenia (4 [9%]/8 [17%]/9 [25%]), rash (9 [20%]/8 [17%]/2 [6%]), vomiting (6 [13%]/13 [28%]/0 [0%]), and diarrhea (8 [17%]/11 [24%]/0 [0%]). Pharmacokinetics analyses showed no drug-drug interactions between volasertib and pemetrexed. CONCLUSION For treatment in the second-line for advanced or metastatic NSCLC, the combination of volasertib with standard pemetrexed did not increase toxicity significantly but also did not improve efficacy compared with single-agent pemetrexed.
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Affiliation(s)
- Peter M Ellis
- Juravinski Cancer Centre, Hamilton, Ontario, Canada.
| | | | - Vera Hirsh
- McGill University Health Centre, Montreal, Quebec, Canada
| | - M Neil Reaume
- The Ottawa Hospital Cancer Centre, Ottawa, Ontario, Canada
| | - Normand Blais
- Centre Hospitalier de l'Universite de Montreal, Montreal, Quebec, Canada
| | | | | | - Yu Gu
- Boehringer Ingelheim Corporation, Ridgefield, CT
| | - Dan Liu
- Boehringer Ingelheim Pharma GmbH & Co KG, Biberach, Germany
| | - Korinna Pilz
- Boehringer Ingelheim Pharma GmbH & Co KG, Biberach, Germany
| | - Quincy Chu
- Cross Cancer Centre, Edmonton, Alberta, Canada
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Kumar S, Kim J. PLK-1 Targeted Inhibitors and Their Potential against Tumorigenesis. BIOMED RESEARCH INTERNATIONAL 2015; 2015:705745. [PMID: 26557691 PMCID: PMC4628734 DOI: 10.1155/2015/705745] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Revised: 05/08/2015] [Accepted: 05/14/2015] [Indexed: 11/18/2022]
Abstract
Mitotic kinases are the key components of the cell cycle machinery and play vital roles in cell cycle progression. PLK-1 (Polo-like kinase-1) is a crucial mitotic protein kinase that plays an essential role in both the onset of G2/M transition and cytokinesis. The overexpression of PLK-1 is strongly correlated with a wide spectrum of human cancers and poor prognosis. The (si)RNA-mediated depletion of PLK-1 arrests tumor growth and triggers apoptosis in cancer cells without affecting normal cells. Therefore, PLK-1 has been selected as an attractive anticancer therapeutic drug target. Some small molecules have been discovered to target the catalytic and noncatalytic domains of PLK-1. These domains regulate the catalytic activation and subcellular localization of PLK-1. However, while PLK-1 inhibitors block tumor growth, they have been shown to cause severe adverse complications, such as toxicity, neutropenia, and bone marrow suppression during clinical trials, due to a lack of selectivity and specificity within the human kinome. To minimize these toxicities, inhibitors should be tested against all protein kinases in vivo and in vitro to enhance selectivity and specificity against targets. Here, we discuss the potency and selectivity of PLK-1-targeted inhibitors and their molecular interactions with PLK-1 domains.
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Affiliation(s)
- Shiv Kumar
- Department of Biochemistry, Institute of Cell Differentiation and Aging, College of Medicine, Hallym University, Chuncheon, Gangwon-do 200-702, Republic of Korea
| | - Jaebong Kim
- Department of Biochemistry, Institute of Cell Differentiation and Aging, College of Medicine, Hallym University, Chuncheon, Gangwon-do 200-702, Republic of Korea
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Wang C, Liu W, Liu Z, Chen L, Liu X, Kuang S. Hypoxia Inhibits Myogenic Differentiation through p53 Protein-dependent Induction of Bhlhe40 Protein. J Biol Chem 2015; 290:29707-16. [PMID: 26468276 DOI: 10.1074/jbc.m115.688671] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Indexed: 11/06/2022] Open
Abstract
Satellite cells are muscle-resident stem cells capable of self-renewal and differentiation to repair injured muscles. However, muscle injury often leads to an ischemic hypoxia environment that impedes satellite cell differentiation and reduces the efficiency of muscle regeneration. Here we performed microarray analyses and identified the basic helix-loop-helix family transcription factor Bhlhe40 as a candidate mediator of the myogenic inhibitory effect of hypoxia. Bhlhe40 is strongly induced by hypoxia in satellite cell-derived primary myoblasts. Overexpression of Bhlhe40 inhibits Myog expression and mimics the effect of hypoxia on myogenesis. Inhibition of Bhlhe40, conversely, up-regulates Myog expression and promotes myogenic differentiation. Importantly, Bhlhe40 knockdown rescues myogenic differentiation under hypoxia. Mechanistically, Bhlhe40 binds to the proximal E-boxes of the Myog promoter and reduces the binding affinity and transcriptional activity of MyoD on Myog. Interestingly, hypoxia induces Bhlhe40 expression independent of HIF1α but through a novel p53-dependent signaling pathway. Our study establishes a crucial role of Bhlhe40 in mediating the repressive effect of hypoxia on myogenic differentiation and suggests that inhibition of Bhlhe40 or p53 may facilitate muscle regeneration after ischemic injuries.
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Affiliation(s)
- Chao Wang
- From the Departments of Animal Science and
| | - Weiyi Liu
- From the Departments of Animal Science and
| | - Zuojun Liu
- From the Departments of Animal Science and
| | | | - Xiaoqi Liu
- Biochemistry and Center for Cancer Research, Purdue University, West Lafayette, Indiana 47906
| | - Shihuan Kuang
- From the Departments of Animal Science and Center for Cancer Research, Purdue University, West Lafayette, Indiana 47906
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Posch C, Cholewa BD, Vujic I, Sanlorenzo M, Ma J, Kim ST, Kleffel S, Schatton T, Rappersberger K, Gutteridge R, Ahmad N, Ortiz/Urda S. Combined Inhibition of MEK and Plk1 Has Synergistic Antitumor Activity in NRAS Mutant Melanoma. J Invest Dermatol 2015; 135:2475-2483. [PMID: 26016894 PMCID: PMC4567913 DOI: 10.1038/jid.2015.198] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Revised: 05/08/2015] [Accepted: 05/18/2015] [Indexed: 02/08/2023]
Abstract
About one-third of cancers harbor activating mutations in rat sarcoma viral oncogene homolog (RAS) oncogenes. In melanoma, aberrant neuroblastoma-RAS (NRAS) signaling fuels tumor progression in about 20% of patients. Current therapeutics for NRAS-driven malignancies barely affect overall survival. To date, pathway interference downstream of mutant NRAS seems to be the most promising approach. In this study, data revealed that mutant NRAS induced Polo-like kinase 1 (Plk1) expression, and pharmacologic inhibition of Plk1 stabilized the size of NRAS mutant melanoma xenografts. The combination of mitogen-activated protein kinase/extracellular signal-regulated kinase kinase (MEK) and Plk1 inhibitors resulted in a significant growth reduction of NRAS mutant melanoma cells in vitro, and regression of xenografted NRAS mutant melanoma in vivo. Independent cell cycle arrest and increased induction of apoptosis underlies the synergistic effect of this combination. Data further suggest that the p53 signaling pathway is of key importance to the observed therapeutic efficacy. This study provides in vitro, in vivo, and first mechanistic data that an MEK/Plk1 inhibitor combination might be a promising treatment approach for patients with NRAS-driven melanoma. As mutant NRAS signaling is similar across different malignancies, this inhibitor combination could also offer a previously unreported treatment modality for NRAS mutant tumors of other cell origins.
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Affiliation(s)
- C Posch
- University of California San Francisco, Department of Dermatology, Mt. Zion Cancer Research Center, 2340 Sutter Street N461, 94115 San Francisco – USA
- Brigham and Women's Hospital, Harvard Medical School, Department of Dermatology, 77 Avenue Louis Pasteur, 02115 Boston – USA
- The Rudolfstiftung Hospital, Academic Teaching Hospital, Medical University Vienna, Department of Dermatology, Juchgasse 25, 1030 Vienna – Austria
| | - BD Cholewa
- University of Wisconsin, Department of Dermatology, 7418 Wisconsin Institutes for Medical Research, 1111 Highland Ave, Madison, WI 53705 – USA
| | - I Vujic
- University of California San Francisco, Department of Dermatology, Mt. Zion Cancer Research Center, 2340 Sutter Street N461, 94115 San Francisco – USA
- The Rudolfstiftung Hospital, Academic Teaching Hospital, Medical University Vienna, Department of Dermatology, Juchgasse 25, 1030 Vienna – Austria
| | - M Sanlorenzo
- University of California San Francisco, Department of Dermatology, Mt. Zion Cancer Research Center, 2340 Sutter Street N461, 94115 San Francisco – USA
- Department of Medical Sciences, Section of Dermatology, University of Turin – Italy
| | - J Ma
- University of California San Francisco, Department of Dermatology, Mt. Zion Cancer Research Center, 2340 Sutter Street N461, 94115 San Francisco – USA
| | - ST Kim
- University of California San Francisco, Department of Dermatology, Mt. Zion Cancer Research Center, 2340 Sutter Street N461, 94115 San Francisco – USA
| | - S Kleffel
- Brigham and Women's Hospital, Harvard Medical School, Department of Dermatology, 77 Avenue Louis Pasteur, 02115 Boston – USA
| | - T Schatton
- Brigham and Women's Hospital, Harvard Medical School, Department of Dermatology, 77 Avenue Louis Pasteur, 02115 Boston – USA
| | - K Rappersberger
- The Rudolfstiftung Hospital, Academic Teaching Hospital, Medical University Vienna, Department of Dermatology, Juchgasse 25, 1030 Vienna – Austria
| | - R Gutteridge
- University of Wisconsin, Department of Dermatology, 7418 Wisconsin Institutes for Medical Research, 1111 Highland Ave, Madison, WI 53705 – USA
| | - N Ahmad
- University of Wisconsin, Department of Dermatology, 7418 Wisconsin Institutes for Medical Research, 1111 Highland Ave, Madison, WI 53705 – USA
| | - S Ortiz/Urda
- University of California San Francisco, Department of Dermatology, Mt. Zion Cancer Research Center, 2340 Sutter Street N461, 94115 San Francisco – USA
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80
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Lange L, Hemmerich P, Spänkuch B. Survival of primary, but not of cancer cells after combined Plk1-HDAC inhibition. Oncotarget 2015; 6:25801-14. [PMID: 26317649 PMCID: PMC4694867 DOI: 10.18632/oncotarget.4445] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2015] [Accepted: 06/16/2015] [Indexed: 01/15/2023] Open
Abstract
In the current study we examined the combination of SAHA and SBE13 in cancer and non-cancer cells. HeLa cells displayed a synergistically reduced cell proliferation, which was much weaker in hTERT-RPE1 or NIH-3T3 cells. Cell cycle distribution differed in HeLa, hTERT-RPE1 and NIH-3T3 cells. SAHA-treated HeLa cells showed slightly increasing cell numbers in G2/M phase, but after combination with SBE13 strongly elevated cell numbers in G2/M and S phase, accompanied by decreasing G0/G1 percentages. hTERT-RPE1 and NIH-3T3 cells showed strongly enriched cell numbers in G0/G1 phase. Western blot and quantitative real time analyses revealed reduced Plk1 mRNA and protein in all cells. p21 protein was strongly induced in cancer, but not in non-cancer cells, corresponding to a different localization in immunofluorescence studies. Additionally, these revealed an abundantly present pRb protein in HeLa cells after any treatment but almost completely vanished pRb staining in treated hTERT-RPE1 cells. These differences could be approved in Western blots against Parp and Caspase 3, which were activated in HeLa, but not in hTERT-RPE1 cells. Thus, we observed for the first time a differential effect of cancer versus non-cancer cells after treatment with SAHA and SBE13, which might be due to the dual role of p21.
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Affiliation(s)
- Lisa Lange
- Friedrich-Schiller-University, CMB, Institute for Biochemistry and Biophysics, 07745 Jena, Germany
| | - Peter Hemmerich
- Leibniz-Institute for Age Research-Fritz Lipmann Institute, JenAge (Jena Centre for Systems Biology of Aging), 07745 Jena, Germany
| | - Birgit Spänkuch
- Friedrich-Schiller-University, CMB, Institute for Biochemistry and Biophysics, 07745 Jena, Germany
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81
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Archambault V, Lépine G, Kachaner D. Understanding the Polo Kinase machine. Oncogene 2015; 34:4799-807. [PMID: 25619835 DOI: 10.1038/onc.2014.451] [Citation(s) in RCA: 103] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Revised: 11/27/2014] [Accepted: 11/28/2014] [Indexed: 12/26/2022]
Abstract
The Polo Kinase is a central regulator of cell division required for several events of mitosis and cytokinesis. In addition to a kinase domain (KD), Polo-like kinases (Plks) comprise a Polo-Box domain (PBD), which mediates protein interactions with targets and regulators of Plks. In all organisms that contain Plks, one Plk family member fulfills several essential functions in the regulation of cell division, and here we refer to this conserved protein as Polo Kinase (Plk1 in humans). The PBD and the KD are capable of both cooperation and mutual inhibition in their functions. Crystal structures of the PBD, the KD and, recently, a PBD-KD complex have helped understanding the inner workings of the Polo Kinase. In parallel, an impressive array of molecular mechanisms has been found to mediate the regulation of the protein. Moreover, the targeting of Polo Kinase in the development of anti-cancer drugs has yielded several molecules with which to chemically modulate Polo Kinase to study its biological functions. Here we review our current understanding of the protein function and regulation of Polo Kinase as a fascinating molecular device in control of cell division.
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Affiliation(s)
- V Archambault
- Institut de recherche en immunologie et en cancérologie, Département de biochimie et médecine moléculaire, Université de Montréal, Montréal, Québec, Canada
| | - G Lépine
- Institut de recherche en immunologie et en cancérologie, Département de biochimie et médecine moléculaire, Université de Montréal, Montréal, Québec, Canada
| | - D Kachaner
- Institut de recherche en immunologie et en cancérologie, Département de biochimie et médecine moléculaire, Université de Montréal, Montréal, Québec, Canada
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82
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Chan C, Xie C, Tsang M, Lear S, Dai L, Zhou Y, Cicho J, Karbowiak M, Hreniak D, Lan R, Cobb SL, Lam MH, Hao J, Wong K. The Effects of Morphology and Linker Length on the Properties of Peptide–Lanthanide Upconversion Nanomaterials as G2 Phase Cell Cycle Inhibitors. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500321] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Chi‐Fai Chan
- Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong, P. R. China, http://chemistry.hkbu.edu.hk/garywong/
| | - Chen Xie
- Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong, P. R. China, http://chemistry.hkbu.edu.hk/garywong/
| | - Ming‐Kiu Tsang
- Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, P. R. China
| | - Sam Lear
- Department of Chemistry, Durham University, Durham, DH1 3LE, U.K
| | - Lixiong Dai
- Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong, P. R. China, http://chemistry.hkbu.edu.hk/garywong/
| | - Yan Zhou
- Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong, P. R. China, http://chemistry.hkbu.edu.hk/garywong/
| | - Jakub Cicho
- Faculty of Chemistry, University of Wroclaw, ul. F. Joliot‐Curie 14, 50‐383 Wroclaw, Poland
| | - Miroslaw Karbowiak
- Faculty of Chemistry, University of Wroclaw, ul. F. Joliot‐Curie 14, 50‐383 Wroclaw, Poland
| | - Dariusz Hreniak
- Institute of Low Temperature and Structure Research, Polish Academy Sciences, 50‐422 Wroclaw, Poland
| | - Rongfeng Lan
- HKBU Institute of Research and Continuing Education, Shenzhen 518000, P. R. China
| | - Steve L. Cobb
- Department of Chemistry, Durham University, Durham, DH1 3LE, U.K
| | - Michael Hon‐Wah Lam
- Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong, P. R. China
| | - Jianhua Hao
- Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, P. R. China
| | - Ka‐Leung Wong
- Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong, P. R. China, http://chemistry.hkbu.edu.hk/garywong/
- Changshu Research Institute of Hong Kong Baptist University, Changshu Economic and Technological Development Zone, Jiangsu 215500, P. R. China
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83
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Wang Y, Li J, Chen Y, Oupický D. Balancing polymer hydrophobicity for ligand presentation and siRNA delivery in dual function CXCR4 inhibiting polyplexes. Biomater Sci 2015; 3:1114-23. [PMID: 26146552 PMCID: PMC4486362 DOI: 10.1039/c5bm00003c] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
In the present study, a series of copolymers (PAMD-Ch) was synthesized by grafting polymeric Plerixafor/AMD3100 (PAMD) with different amounts of cholesterol and the effect of cholesterol modification on siRNA delivery was investigated. PAMD-Ch/siRNA polyplexes exhibited improved colloidal and enzymatic stability when compared with PAMD/siRNA polyplexes containing no cholesterol. PAMD-Ch with low (17 wt%) and medium (25 wt%) cholesterol content exhibited CXCR4 antagonism comparable to unmodified PAMD. Cholesterol modification increased cell uptake of siRNA polyplexes and significantly decreased sensitivity of siRNA transfection to the presence of serum. When used to deliver anticancer siRNA against polo-like kinase 1 (PLK1), polyplexes based on PAMD-Ch with 17 wt% cholesterol exhibited the highest cancer cell killing activity both in serum-free and serum-containing conditions. Overall, the results of this study validate cholesterol modified PAMD as dual-function delivery vectors suitable for efficient delivery of anticancer siRNA and simultaneous CXCR4 inhibition for combined anticancer therapies.
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Affiliation(s)
- Y Wang
- Center for Drug Delivery and Nanomedicine, Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, NE, USA
| | - J Li
- Center for Drug Delivery and Nanomedicine, Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, NE, USA
| | - Y Chen
- Center for Drug Delivery and Nanomedicine, Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, NE, USA
| | - D Oupický
- Center for Drug Delivery and Nanomedicine, Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, NE, USA. ; Department of Chemistry, University of Nebraska, Lincoln, NE, USA. ; Department of Pharmaceutical Sciences, China Pharmaceutical University, Nanjing, China
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84
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Kazazian K, Brashavitskaya O, Zih FSW, Berger-Richardson D, Xu RSZ, Pacholczyk K, Macmillan J, Swallow CJ. Polo-Like Kinases in Colorectal Cancer: Potential for Targeted Therapy. CURRENT COLORECTAL CANCER REPORTS 2015. [DOI: 10.1007/s11888-015-0275-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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85
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Liu X. Targeting Polo-Like Kinases: A Promising Therapeutic Approach for Cancer Treatment. Transl Oncol 2015; 8:185-95. [PMID: 26055176 PMCID: PMC4486469 DOI: 10.1016/j.tranon.2015.03.010] [Citation(s) in RCA: 122] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Revised: 03/19/2015] [Accepted: 03/24/2015] [Indexed: 12/29/2022] Open
Abstract
Polo-like kinases (Plks) are a family of serine-threonine kinases that regulate multiple intracellular processes including DNA replication, mitosis, and stress response. Plk1, the most well understood family member, regulates numerous stages of mitosis and is overexpressed in many cancers. Plk inhibitors are currently under clinical investigation, including phase III trials of volasertib, a Plk inhibitor, in acute myeloid leukemia and rigosertib, a dual inhibitor of Plk1/phosphoinositide 3-kinase signaling pathways, in myelodysplastic syndrome. Other Plk inhibitors, including the Plk1 inhibitors GSK461364A, TKM-080301, GW843682, purpurogallin, and poloxin and the Plk4 inhibitor CFI-400945 fumarate, are in earlier clinical development. This review discusses the biologic roles of Plks in cell cycle progression and cancer, and the mechanisms of action of Plk inhibitors currently in development as cancer therapies.
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Affiliation(s)
- Xiaoqi Liu
- Purdue University, West Lafayette, IN, USA.
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86
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Christensen MD, Elmer JJ, Eaton S, Gonzalez-Malerva L, LaBaer J, Rege K. Kinome-level screening identifies inhibition of polo-like kinase-1 (PLK1) as a target for enhancing non-viral transgene expression. J Control Release 2015; 204:20-9. [PMID: 25681050 PMCID: PMC8292636 DOI: 10.1016/j.jconrel.2015.01.036] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Revised: 01/13/2015] [Accepted: 01/28/2015] [Indexed: 01/01/2023]
Abstract
Human cells contain hundreds of kinase enzymes that regulate several cellular processes, which likely include transgene delivery and expression. We identified several kinases that influence gene delivery and/or expression by performing a kinome-level screen in which, we identified small-molecule kinase inhibitors that significantly enhanced non-viral (polymer-mediated) transgene (luciferase) expression in cancer cells. The strongest enhancement was observed with several small-molecule inhibitors of Polo-like Kinase 1 (PLK 1) (e.g., HMN-214 and BI 2536), which enhanced luciferase expression up to 30-fold by arresting cells in the G2/M phase of the cell cycle and influencing intracellular trafficking of plasmid DNA. Knockdown of PLK 1 using an shRNA-expressing lentivirus further confirmed the enhancement of polymer-mediated transgene expression. In addition, pairwise and three-way combinations of PLK1 inhibitors with the histone deacetylase-1 (HDAC-1) inhibitor Entinostat and the JAK/STAT inhibitor AG-490 enhanced luciferase expression to levels significantly higher than individual drug treatments acting alone. These findings indicate that inhibition of specific intracellular kinases (e.g., PLK1) can significantly enhance non-viral transgene expression for applications in biotechnology and medicine.
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Affiliation(s)
- Matthew D Christensen
- Chemical Engineering, School for Engineering of Matter, Transport, and Energy, Arizona State University, Tempe, AZ, USA
| | - Jacob J Elmer
- Chemical Engineering, School for Engineering of Matter, Transport, and Energy, Arizona State University, Tempe, AZ, USA
| | - Seron Eaton
- The Virginia G. Piper Center for Personalized Diagnostics, The Biodesign Institute, Arizona State University, Tempe, AZ, USA
| | - Laura Gonzalez-Malerva
- The Virginia G. Piper Center for Personalized Diagnostics, The Biodesign Institute, Arizona State University, Tempe, AZ, USA
| | - Joshua LaBaer
- The Virginia G. Piper Center for Personalized Diagnostics, The Biodesign Institute, Arizona State University, Tempe, AZ, USA
| | - Kaushal Rege
- Chemical Engineering, School for Engineering of Matter, Transport, and Energy, Arizona State University, Tempe, AZ, USA.
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87
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Guest ST, Kratche ZR, Bollig-Fischer A, Haddad R, Ethier SP. Two members of the TRiC chaperonin complex, CCT2 and TCP1 are essential for survival of breast cancer cells and are linked to driving oncogenes. Exp Cell Res 2015; 332:223-35. [DOI: 10.1016/j.yexcr.2015.02.005] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Revised: 02/02/2015] [Accepted: 02/07/2015] [Indexed: 11/26/2022]
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88
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Shao C, Ahmad N, Hodges K, Kuang S, Ratliff T, Liu X. Inhibition of polo-like kinase 1 (Plk1) enhances the antineoplastic activity of metformin in prostate cancer. J Biol Chem 2015; 290:2024-33. [PMID: 25505174 PMCID: PMC4303657 DOI: 10.1074/jbc.m114.596817] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Revised: 12/08/2014] [Indexed: 01/21/2023] Open
Abstract
The widely used anti-diabetic drug metformin has been shown to exert strong antineoplastic actions in numerous tumor types, including prostate cancer (PCa). In this study, we show that BI2536, a specific Plk1 inhibitor, acted synergistically with metformin in inhibiting PCa cell proliferation. Furthermore, we also provide evidence that Plk1 inhibition makes PCa cells carrying WT p53 much more sensitive to low-dose metformin treatment. Mechanistically, we found that co-treatment with BI2536 and metformin induced p53-dependent apoptosis and further activated the p53/Redd-1 pathway. Moreover, we also show that BI2536 treatment inhibited metformin-induced glycolysis and glutamine anaplerosis, both of which are survival responses of cells against mitochondrial poisons. Finally, we confirmed the cell-based observations using both cultured cell-derived and patient-derived xenograft studies. Collectively, our findings support another promising therapeutic strategy by combining two well tolerated drugs against PCa proliferation and the progression of androgen-dependent PCa to the castration-resistant stage.
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Affiliation(s)
- Chen Shao
- From the Departments of Biochemistry and
| | - Nihal Ahmad
- the Department of Dermatology, University of Wisconsin, Madison, Wisconsin 53706, and
| | - Kurt Hodges
- the Department of Pathology and Laboratory Medicine, Indiana University School of Medicine, Indianapolis, Indiana 46202
| | | | - Tim Ratliff
- the Purdue Center for Cancer Research, Purdue University, West Lafayette, Indiana 47907
| | - Xiaoqi Liu
- From the Departments of Biochemistry and the Purdue Center for Cancer Research, Purdue University, West Lafayette, Indiana 47907,
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89
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Chan CF, Lan R, Tsang MK, Zhou D, Lear S, Chan WL, Cobb SL, Wong WK, Hao J, Wong WT, Wong KL. Directional Plk1 inhibition-driven cell cycle interruption using amphiphilic thin-coated peptide-lanthanide upconversion nanomaterials as in vivo tumor suppressors. J Mater Chem B 2015; 3:2624-2634. [PMID: 32262910 DOI: 10.1039/c4tb02104e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Polo-like kinase 1 (Plk1) is a major serine/threonine protein kinase which regulates key mitotic events.
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Affiliation(s)
- Chi-Fai Chan
- Department of Chemistry
- Hong Kong Baptist University
- Kowloon Tong
- Hong Kong
| | - Rongfeng Lan
- Department of Chemistry
- Hong Kong Baptist University
- Kowloon Tong
- Hong Kong
| | - Ming-Kiu Tsang
- Department of Applied Physics
- The Hong Kong Polytechnic University
- Hong Kong
| | - Di Zhou
- School of Chemistry and Material Engineering Jiangsu
- Key Laboratory of Advanced Functional Materials
- Changshu Institute of Technology
- Changshu
- China
| | - Sam Lear
- Department of Chemistry
- Durham University
- Durham
- UK
| | - Wai-Lun Chan
- Department of Chemistry
- Hong Kong Baptist University
- Kowloon Tong
- Hong Kong
| | | | - Wai-Kwok Wong
- Department of Chemistry
- Hong Kong Baptist University
- Kowloon Tong
- Hong Kong
| | - Jianhua Hao
- Department of Applied Physics
- The Hong Kong Polytechnic University
- Hong Kong
| | - Wing-Tak Wong
- Department of Applied Biological and Chemical Technology
- The Hong Kong Polytechnic University
- Hong Kong
- State Key Laboratory for Chirosciences from The Ministry of Science and Technology of the People's Republic of China
- The Hong Kong Polytechnic University
| | - Ka-Leung Wong
- Department of Chemistry
- Hong Kong Baptist University
- Kowloon Tong
- Hong Kong
- Changshu Research Institute of Hong Kong Baptist University
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90
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Park JE, Kim TS, Kim BY, Lee KS. Selective blockade of cancer cell proliferation and anchorage-independent growth by Plk1 activity-dependent suicidal inhibition of its polo-box domain. Cell Cycle 2015; 14:3624-34. [PMID: 26513691 PMCID: PMC4825759 DOI: 10.1080/15384101.2015.1104435] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Revised: 09/23/2015] [Accepted: 09/29/2015] [Indexed: 12/27/2022] Open
Abstract
Polo-like kinase 1 (Plk1) plays a critical role in proper M-phase progression and cell proliferation. Plk1 is overexpressed in a broad spectrum of human cancers and is considered an attractive anticancer drug target. Although a large number of inhibitors targeting the catalytic domain of Plk1 have been developed, these inhibitors commonly exhibit a substantial level of cross-reactivity with other structurally related kinases, thus narrowing their applicable dose for patient treatment. Plk1 contains a C-terminal polo-box domain (PBD) that is essentially required for interacting with its binding targets. However, largely due to the lack of both specific and membrane-permeable inhibitors, whether PBD serves as an alternative target for the development of anticancer therapeutics has not been rigorously examined. Here, we used an intracellularly expressed 29-mer-long PBIP1-derived peptide (i.e., PBIPtide), which can be converted into a "suicidal" PBD inhibitor via Plk1-dependent self-priming and binding. Using this highly specific and potent system, we showed that Plk1 PBD inhibition alone is sufficient for inducing mitotic arrest and apoptotic cell death in cancer cells but not in normal cells, and that cancer cell-selective killing can occur regardless of the presence or absence of oncogenic RAS mutation. Intriguingly, PBD inhibition also effectively prevented anchorage-independent growth of malignant cancer cells. Thus, targeting PBD represents an appealing strategy for anti-Plk1 inhibitor development. Additionally, PBD inhibition-induced cancer cell-selective killing may not simply stem from activated RAS alone but, rather, from multiple altered biochemical and physiological mechanisms, which may have collectively contributed to Plk1 addiction in cancer cells.
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Affiliation(s)
- Jung-Eun Park
- Laboratory of Metabolism; National Cancer Institute; National Institutes of Health; Bethesda, MD USA
| | - Tae-Sung Kim
- Laboratory of Metabolism; National Cancer Institute; National Institutes of Health; Bethesda, MD USA
| | - Bo Yeon Kim
- Incurable Diseases Therapeutics Research Center; Korea Research Institute of Bioscience and Biotechnology; Ochang, Republic of Korea
| | - Kyung S Lee
- Laboratory of Metabolism; National Cancer Institute; National Institutes of Health; Bethesda, MD USA
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91
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Valianou M, Cox AM, Pichette B, Hartley S, Paladhi UR, Astrinidis A. Pharmacological inhibition of Polo-like kinase 1 (PLK1) by BI-2536 decreases the viability and survival of hamartin and tuberin deficient cells via induction of apoptosis and attenuation of autophagy. Cell Cycle 2015; 14:399-407. [PMID: 25565629 PMCID: PMC4353234 DOI: 10.4161/15384101.2014.986394] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2014] [Revised: 11/05/2014] [Accepted: 11/06/2014] [Indexed: 12/19/2022] Open
Abstract
The mechanistic target of rapamycin complex 1 (mTORC1) increases translation, cell size and angiogenesis, and inhibits autophagy. mTORC1 is negatively regulated by hamartin and tuberin, the protein products of the tumor suppressors TSC1 and TSC2 that are mutated in Tuberous Sclerosis Complex (TSC) and sporadic Lymphangioleiomyomatosis (LAM). Hamartin interacts with the centrosomal and mitotic kinase polo-like kinase 1 (PLK1). Hamartin and tuberin deficient cells have abnormalities in centrosome duplication, mitotic progression, and cytokinesis, suggesting that the hamartin/tuberin heterodimer and mTORC1 signaling are involved in centrosome biology and mitosis. Here we report that PLK1 protein levels are increased in hamartin and tuberin deficient cells and LAM patient-derived specimens, and that this increase is rapamycin-sensitive. Pharmacological inhibition of PLK1 by the small-molecule inhibitor BI-2536 significantly decreased the viability and clonogenic survival of hamartin and tuberin deficient cells, which was associated with increased apoptosis. BI-2536 increased p62, LC3B-I and GFP-LC3 punctae, and inhibited HBSS-induced degradation of p62, suggesting that PLK1 inhibition attenuates autophagy. Finally, PLK1 inhibition repressed the expression and protein levels of key autophagy genes and proteins and the protein levels of Bcl(-)2 family members, suggesting that PLK1 regulates both autophagic and apoptotic responses. Taken together, our data point toward a previously unrecognized role of PLK1 on the survival of cells with mTORC1 hyperactivation, and the potential use of PLK1 inhibitors as novel therapeutics for tumors with dysregulated mTORC1 signaling, including TSC and LAM.
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Affiliation(s)
- Matthildi Valianou
- Department of Biochemistry and Molecular
Biology; Drexel University College of Medicine; Philadelphia, PA
USA
| | - Andrew M Cox
- Department of Biochemistry and Molecular
Biology; Drexel University College of Medicine; Philadelphia, PA
USA
| | - Benjamin Pichette
- Department of Biochemistry and Molecular
Biology; Drexel University College of Medicine; Philadelphia, PA
USA
| | - Shannon Hartley
- Department of Biochemistry and Molecular
Biology; Drexel University College of Medicine; Philadelphia, PA
USA
| | - Unmesha Roy Paladhi
- Department of Biochemistry and Molecular
Biology; Drexel University College of Medicine; Philadelphia, PA
USA
| | - Aristotelis Astrinidis
- Department of Biochemistry and Molecular
Biology; Drexel University College of Medicine; Philadelphia, PA
USA
- Laboratory of Biological Chemistry; Department
of Medicine; School of Health Sciences; University of Ioannina,
Greece
- Department of Immunotherapeutics and
Biotechnology; School of Pharmacy; Texas Tech University Health Sciences
Center; Abilene, TX USA
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92
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Nair JS, Schwartz GK. Inhibition of polo like kinase 1 in sarcomas induces apoptosis that is dependent on Mcl-1 suppression. Cell Cycle 2015; 14:3101-11. [PMID: 26236920 PMCID: PMC4825583 DOI: 10.1080/15384101.2015.1078033] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2015] [Revised: 07/06/2015] [Accepted: 07/27/2015] [Indexed: 01/18/2023] Open
Abstract
Sarcomas are rare cancers and the current treatments in inoperable or metastatic disease have not been shown to prolong survival. In order to develop novel targeted therapies, we tested the efficacy of polo-like kinase 1 (PLK-1) inhibitor (TAK-960) in sarcoma. All the sarcoma cell lines were sensitive to TAK-960 with IC50s in the low nanomolar range. We chose MPNST, CHP100 and LS141 for our studies and of which MPNST cells exclusively underwent polyploidy after a delay in mitosis for about 18 hours; CHP100 cells, after a 24h mitotic delay, died of apoptosis; LS141, after a delay in mitosis stayed at 4N with mild apoptosis. Apoptosis induced by TAK-960 in CHP100 was associated with down-regulation of Mcl-1 and the effect was recapitulated by down-regulating PLK1 by siRNA, confirming that the effect of TAK-960 on Mcl-1 expression is target specific. With suppression of Mcl-1 by siRNA, TAK-960 induced apoptosis in MPNST cells as well. These effects were confirmed in vivo, such that TAK-960 more effectively inhibited CHP100 than MPNST xenografts. In the setting of PLK-1 inhibition, Mcl-1 down regulation is shown to be an important determinant of apoptosis. Collectively, the net effect of this is to drive cells to apoptosis, resulting in a greater anti-tumor effect in vivo. Therefore, targeting PLK-1 should have a greater impact in treating sarcomas provided there is concomitant suppression of Mcl-1. These results further indicate that Mcl-1 could be an important biomarker to predict sensitivity to the induction of apoptosis by PLK-1 targeted therapy in sarcoma.
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Affiliation(s)
- Jayasree S Nair
- Jennifer Goodman Linn Laboratory of New Drug Development; Department of Medicine; Memorial Sloan-Kettering Cancer Center; New York, NY USA
| | - Gary K Schwartz
- Jennifer Goodman Linn Laboratory of New Drug Development; Department of Medicine; Memorial Sloan-Kettering Cancer Center; New York, NY USA
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93
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Shan HM, Shi Y, Quan J. Identification of green tea catechins as potent inhibitors of the polo-box domain of polo-like kinase 1. ChemMedChem 2015; 10:158-63. [PMID: 25196850 DOI: 10.1002/cmdc.201402284] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Indexed: 12/21/2022]
Abstract
Polo-like kinase 1 (PLK1) plays crucial functions in multiple stages of mitosis and is considered to be a potential drug target for cancer therapy. The functions of PLK1 are mediated by its N-terminal kinase domain and C-terminal polo-box domain (PBD). Most inhibitors targeting the kinase domain of PLK1 have a selectivity issue because of a high degree of structural conservation within kinase domains of all protein kinases. Here, we combined virtual and experimental screenings to identify green tea catechins as potent inhibitors of the PLK1 PBD. Initially, (-)-epigallocatechin, one of the main components of green tea polyphenols, was found to significantly block the binding of fluorescein-labeled phosphopeptide to the PBD at a concentration of 10 μm. Next, additional catechins were evaluated for their dose-dependent inhibition of the PBD and preliminary structure-activity relationships were derived. Cellular analysis further showed that catechins interfere with the proper subcellular localization of PLK1, lead to cell-cycle arrest in the S and G2M phases, and induce growth inhibition of several human cancer cell types, such as breast adenocarcinoma (MCF7), lung adenocarcinoma (A549), and cervical adenocarcinoma (HeLa). Our data provides new insight into understanding the anticancer activities of green tea catechins.
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Affiliation(s)
- Hong-Mei Shan
- Key Laboratory of Chemical Genomics, School of Chemical Biology & Biotechnology, Peking University, Shenzhen Graduate School, Shenzhen 518055 (China)
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94
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Shao T, Liu X. Identification of rictor as a novel substrate of Polo-like kinase 1. Cell Cycle 2015; 14:755-60. [PMID: 25714006 PMCID: PMC4615041 DOI: 10.1080/15384101.2014.998050] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Revised: 12/08/2014] [Accepted: 12/09/2014] [Indexed: 10/23/2022] Open
Abstract
Plk1 has been essentially described as a critical regulator of many mitotic events. However, increasing evidence supports the notion that its molecular functions are not restricted to the cell cycle. In particular, recent reports suggest the existence of a molecular and functional link between Plk1 and the mammalian target of rapamycin (mTOR) pathway, which controls cell growth and proliferation via the raptor-mTOR (TORC1) and rictor-mTOR (TORC2) protein complexes. Herein, we have identified rapamycin-insensitive companion of mTOR (Rictor), a core component of mTORC2, as a new Plk1 substrate and have shown that Plk1 phosphorylates Rictor at Ser1162 in vitro and in vivo. Surprisingly, cells expressing the unphosphorylatable mutant (S1162A) of Rictor did not show any effect on well characterized canonical PI3K-mTOR pathway. However, we found that cells expressing the unphosphorylatable form of Rictor have an elevated level of mSin1 isoform (mSin1.5). Considering that mSin1.5-containing mTORC2 was reported to associate with stress signaling, we propose that phosphorylation of Rictor at Ser1162 by Plk1 might be involved in a novel signaling pathway by regulating the mSin1.5-defined mTORC2.
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Key Words
- 4E-BP1, eIF4E-binding protein 1
- GST, glutathione S-transferase
- IB, immunoblotting.
- IP, immunoprecipitation
- PDK1, 3-phophoinositide-dependent protein kinase 1 (PDK1)
- Plk1
- Plk1, polo-like kinase 1
- Raptor, regulatory-associated protein of mTOR
- Rictor
- Rictor, rapamycin-insensitive companion of mTOR
- S6K, S6 Kinase
- WT, wild type
- aa, amino acids
- cell cycle
- mSin1
- mSin1, mammalian stress-activated map kinase-interacting protein 1 (mSin1)
- mTOR, mammalian target of rapamycin
- mTORC
- mTORC1, mTOR complex 1
- mTORC2, mTOR complex 2
- phosphorylation
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Affiliation(s)
- Tian Shao
- Department of Biochemistry; Purdue University; West Lafayette, IN USA
| | - Xiaoqi Liu
- Department of Biochemistry; Purdue University; West Lafayette, IN USA
- Purdue Center for Cancer Research; Purdue University; West Lafayette, IN USA
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95
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Raab M, Krämer A, Hehlgans S, Sanhaji M, Kurunci-Csacsko E, Dötsch C, Bug G, Ottmann O, Becker S, Pachl F, Kuster B, Strebhardt K. Mitotic arrest and slippage induced by pharmacological inhibition of Polo-like kinase 1. Mol Oncol 2015; 9:140-54. [PMID: 25169932 PMCID: PMC5528686 DOI: 10.1016/j.molonc.2014.07.020] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Accepted: 07/25/2014] [Indexed: 01/22/2023] Open
Abstract
Exposure to drugs that interfere with microtubule dynamics block cell cycle progression at mitosis by prolonged activation of the spindle assembly checkpoint (SAC). Cells can evade mitotic arrest and proceed to interphase without chromosome segregation by a process termed mitotic slippage that involves Cyclin B1 degradation without checkpoint inactivation. Here, we explored the cellular response to small-molecule inhibitors of Polo-like kinase 1 (Plk1), an important regulator of cell division. We found that the clinical Plk1 inhibitors BI 2536 and BI 6727, both unexpectedly, induced a dose-dependent cellular drug response: While mitotic arrest was induced in cancer cell lines and primary non-transformed cells across the entire range of concentrations tested, only high concentrations seemed to promote mitotic slippage. Since this observation contrasts with the effects expected from studies reporting RNAi-mediated Plk1 depletion in cancer cells, we wondered whether both ATP-competitive inhibitors target unknown kinases that are involved in signaling from the spindle assembly checkpoint (SAC) and might contribute to the mitotic slippage. A chemical proteomics approach used to profile the selectivity of both inhibitors revealed that SAC kinases are not targeted directly. Still, the activities of Cdk1/Cyclin B1 and Aurora B, which plays important roles in the error correction of false microtubule-kinetochore attachments and in checkpoint signaling, were shown to be downregulated at high inhibitor concentrations. Our data suggest that the inhibition of Plk1 activity below a certain threshold influences Aurora B activity via reduced phosphorylation of Fox M1 and Survivin leading to diminished levels of Aurora B protein and alteration of its subcellular localization. Within the spectrum of SAC proteins that are degraded during mitotic slippage, the degradation of Cyclin B1 and the downregulation of Aurora B activity by Plk1 inhibition seem to be critical promoters of mitotic slippage. The results indicate that careful dose-finding studies in cancer trials are necessary to limit or even prevent mitotic slippage, which could be associated with improved cancer cell survival.
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Affiliation(s)
- Monika Raab
- Department of Gynecology, School of Medicine, Goethe University, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany
| | - Andrea Krämer
- Department of Gynecology, School of Medicine, Goethe University, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany
| | | | - Mourad Sanhaji
- Department of Gynecology, School of Medicine, Goethe University, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany
| | - Elisabeth Kurunci-Csacsko
- Department of Gynecology, School of Medicine, Goethe University, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany
| | - Christina Dötsch
- Department of Gynecology, School of Medicine, Goethe University, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany
| | - Gesine Bug
- Department of Medicine, Hematology/Oncology, Goethe University, Germany
| | - Oliver Ottmann
- Department of Medicine, Hematology/Oncology, Goethe University, Germany
| | - Sven Becker
- Department of Gynecology, School of Medicine, Goethe University, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany
| | - Fiona Pachl
- Technische Universität München, Emil Erlenmeyer Forum 5, 85354 Freising, Germany
| | - Bernhard Kuster
- Technische Universität München, Emil Erlenmeyer Forum 5, 85354 Freising, Germany; German Cancer Consortium (DKTK), Heidelberg, Germany
| | - Klaus Strebhardt
- Department of Gynecology, School of Medicine, Goethe University, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany; German Cancer Consortium (DKTK), Heidelberg, Germany.
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96
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Sero V, Tavanti E, Vella S, Hattinger CM, Fanelli M, Michelacci F, Versteeg R, Valsasina B, Gudeman B, Picci P, Serra M. Targeting polo-like kinase 1 by NMS-P937 in osteosarcoma cell lines inhibits tumor cell growth and partially overcomes drug resistance. Invest New Drugs 2014; 32:1167-80. [PMID: 25193492 DOI: 10.1007/s10637-014-0158-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Accepted: 09/01/2014] [Indexed: 12/30/2022]
Abstract
BACKGROUND Polo-like kinase 1 (PLK1) has emerged as a prognostic factor in various neoplasms, but only scarce data have been reported for high-grade osteosarcoma (OS). In this study, we assessed PLK1 expression and the efficacy of PLK1 inhibitor NMS-P937 in OS. METHODS PLK1 expression was assessed on 21 OS clinical samples and on a panel of human OS cell lines. In vitro efficacy of NMS-P937 was evaluated on nine drug-sensitive and six drug-resistant human OS cell lines, either as single agent or in combination with the drugs used in chemotherapy for OS. RESULTS PLK1 expression was higher in OS clinical samples and cell lines compared to normal human tissue. A higher PLK1 expression at diagnosis appeared to be associated with an unfavourable clinical outcome. PLK1 silencing produced growth inhibition, cell cycle retardation and apoptosis induction in human OS cell lines. NMS-P937 proved to be highly active in both drug-sensitive and drug-resistant cell lines, with the only exception of ABCB1-overexpressing, Doxorubicin (DX)-resistant variants. However, in these cells, the association of NMS-P937 with DX was able to revert DX-resistance by negatively interfering with ABCB1 transport activity. NMS-P937 was also able to decrease clonogenic and migration ability of human OS cell lines. CONCLUSION PLK1 can be proposed as a new candidate target for OS. Targeting PLK1 in OS with NMS-P937 in association with conventional chemotherapeutic drugs may be a new interesting therapeutic option, since this approach has proved to be active against drug resistant cells.
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Affiliation(s)
- Valeria Sero
- Laboratory of Experimental Oncology, Rizzoli Orthopaedic Institute, Via di Barbiano 1/10, 40136, Bologna, Italy
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97
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Li Z, Li J, Bi P, Lu Y, Burcham G, Elzey BD, Ratliff T, Konieczny SF, Ahmad N, Kuang S, Liu X. Plk1 phosphorylation of PTEN causes a tumor-promoting metabolic state. Mol Cell Biol 2014; 34:3642-61. [PMID: 25047839 PMCID: PMC4187734 DOI: 10.1128/mcb.00814-14] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2014] [Accepted: 07/17/2014] [Indexed: 11/20/2022] Open
Abstract
One outcome of activation of the phosphatidylinositol 3-kinase (PI3K) pathway is increased aerobic glycolysis, but the upstream signaling events that regulate the PI3K pathway, and thus the Warburg effect, are elusive. Increasing evidence suggests that Plk1, a cell cycle regulator, is also involved in cellular events in addition to mitosis. To test whether Plk1 contributes to activation of the PI3K pathway, and thus aerobic glycolysis, we examined potential targets of Plk1 and identified PTEN as a Plk1 substrate. We hypothesize that Plk1 phosphorylation of PTEN leads to its inactivation, activation of the PI3K pathway, and the Warburg effect. Our data show that overexpression of Plk1 leads to activation of the PI3K pathway and enhanced aerobic glycolysis. In contrast, inhibition of Plk1 causes markedly reduced glucose metabolism in mice. Mechanistically, we show that Plk1 phosphorylation of PTEN and Nedd4-1, an E3 ubiquitin ligase of PTEN, results in PTEN inactivation. Finally, we show that Plk1 phosphorylation of PTEN promotes tumorigenesis in both its phosphatase-dependent and -independent pathways, revealing potentially new drug targets to arrest tumor cell growth.
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Affiliation(s)
- Zhiguo Li
- Department of Biochemistry, Purdue University, West Lafayette, Indiana, USA
| | - Jie Li
- Department of Biochemistry, Purdue University, West Lafayette, Indiana, USA
| | - Pengpeng Bi
- Department of Animal Sciences, Purdue University, West Lafayette, Indiana, USA
| | - Ying Lu
- Department of Biochemistry, Purdue University, West Lafayette, Indiana, USA
| | - Grant Burcham
- Department of Comparative Pathobiology, Purdue University, West Lafayette, Indiana, USA
| | - Bennett D Elzey
- Department of Comparative Pathobiology, Purdue University, West Lafayette, Indiana, USA
| | - Timothy Ratliff
- Department of Comparative Pathobiology, Purdue University, West Lafayette, Indiana, USA Purdue Center for Cancer Research, Purdue University, West Lafayette, Indiana, USA
| | - Stephen F Konieczny
- Department of Biological Sciences, Purdue University, West Lafayette, Indiana, USA Purdue Center for Cancer Research, Purdue University, West Lafayette, Indiana, USA
| | - Nihal Ahmad
- Department of Dermatology, University of Wisconsin, Madison, Wisconsin, USA
| | - Shihuan Kuang
- Department of Animal Sciences, Purdue University, West Lafayette, Indiana, USA Purdue Center for Cancer Research, Purdue University, West Lafayette, Indiana, USA
| | - Xiaoqi Liu
- Department of Biochemistry, Purdue University, West Lafayette, Indiana, USA Purdue Center for Cancer Research, Purdue University, West Lafayette, Indiana, USA
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98
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Randomized, phase 2 trial of low-dose cytarabine with or without volasertib in AML patients not suitable for induction therapy. Blood 2014; 124:1426-33. [PMID: 25006120 DOI: 10.1182/blood-2014-03-560557] [Citation(s) in RCA: 184] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Treatment outcomes for older patients with acute myeloid leukemia (AML) have remained dismal. This randomized, phase 2 trial in AML patients not considered suitable for intensive induction therapy compared low-dose cytarabine (LDAC) with or without volasertib, a highly potent and selective inhibitor of polo-like kinases. Eighty-seven patients (median age 75 years) received LDAC 20 mg twice daily subcutaneously days 1-10 or LDAC + volasertib 350 mg IV days 1 + 15 every 4 weeks. Response rate (complete remission and complete remission with incomplete blood count recovery) was higher for LDAC + volasertib vs LDAC (31.0% vs 13.3%; odds ratio, 2.91; P = .052). Responses in the LDAC + volasertib arm were observed across all genetic groups, including 5 of 14 patients with adverse cytogenetics. Median event-free survival was significantly prolonged by LDAC + volasertib compared with LDAC (5.6 vs 2.3 months; hazard ratio, 0.57; 95% confidence interval, 0.35-0.92; P = .021); median overall survival was 8.0 vs 5.2 months, respectively (hazard ratio, 0.63; 95% confidence interval, 0.40-1.00; P = .047). LDAC + volasertib led to an increased frequency of adverse events that was most pronounced for neutropenic fever/infections and gastrointestinal events; there was no increase in the death rate at days 60 + 90. This study was registered at www.clinicaltrials.gov as #NCT00804856.
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99
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Craig SN, Wyatt MD, McInnes C. Current assessment of polo-like kinases as anti-tumor drug targets. Expert Opin Drug Discov 2014; 9:773-89. [PMID: 24819909 DOI: 10.1517/17460441.2014.918100] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
INTRODUCTION Polo-like kinase (PLK)1 is the most studied of the PLK family and is a serine/threonine kinase that plays pivotal roles in many aspects of mitosis and hence its deregulation is prevalent in various malignant tumor types. AREAS COVERED In this review, the authors discuss the relevancy of PLK1 and other PLK members as oncology targets in light of known roles of these kinases and the observed phenotypic consequence of downregulating their activity, depending on how they are targeted. Furthermore, they also discuss the pathways mutated in cancer that have been shown to enhance sensitivity toward PLK1 inhibitors in the context of tumor types that possess these molecular defects. They also summarize preclinical and clinical investigations that have been undertaken for both ATP and non-ATP competitive inhibitors. EXPERT OPINION PLKs 2, 3 and 5 are primarily linked with tumor suppressor functions and as PLK1 is the most validated anticancer drug target, selective inhibitors for its activities are most likely to result in effective therapeutics with reduced side effects. In this regard, the polo box domain can be targeted to generate selective inhibitors of PLK1 while preventing inhibition of kinases outside of this family. Recent studies confirming the synthetic lethality of other molecular defects with PLK1 can be exploited to obtain tumor selective apoptosis in p53, KRAS and PTEN mutant cancers.
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Affiliation(s)
- Sandra N Craig
- University of South Carolina, South Carolina College of Pharmacy, Drug Discovery and Biomedical Sciences , Columbia, SC, 29208 , USA +1 803 576 5684 ;
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100
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van der Meer R, Song HY, Park SH, Abdulkadir SA, Roh M. RNAi screen identifies a synthetic lethal interaction between PIM1 overexpression and PLK1 inhibition. Clin Cancer Res 2014; 20:3211-21. [PMID: 24771642 PMCID: PMC4086184 DOI: 10.1158/1078-0432.ccr-13-3116] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
PURPOSE To identify genes whose depletion is detrimental to Pim1-overexpressing prostate cancer cells and to validate this finding in vitro and in vivo. EXPERIMENTAL DESIGN RNAi screening was used to identify genes whose depletion is detrimental to Pim1-overexpressing cells. Our finding was validated using shRNA or PLK1-specific inhibitor BI 2536. Xenograft studies were performed using both PLK1-knockdown cells and BI 2536 to investigate the effects of PLK1 inhibition on tumorigenesis in Pim1-overexpressing cells. Finally, PLK1 and PIM1 expression patterns in human prostate tumors were examined by immunohistochemistry using tissue microarrays. RESULTS We identified the mitotic regulator polo-like kinase (PLK1) as a gene whose depletion is particularly detrimental to the viability of Pim1-overexpressing prostate cancer. Inhibition of PLK1 by shRNA or BI 2536 in Pim1-overexpressing prostate cancer xenograft models resulted in a dramatic inhibition of tumor progression. Notably, Pim1-overexpressing cells were more prone to mitotic arrest followed by apoptosis due to PLK1 inhibition than control cells. Furthermore, inhibition of PLK1 led to the reduction of MYC protein levels both in vitro and in vivo. Our data also suggest that PIM1 and PLK1 physically interact and PIM1 might phosphorylate PLK1. Finally, PLK1 and PIM1 are frequently co-expressed in human prostate tumors, and co-expression of PLK1 and PIM1 was significantly correlated to higher Gleason grades. CONCLUSIONS Our findings demonstrate that PIM1-overexpressing cancer cells are particularly sensitive to PLK1 inhibition, suggesting that PIM1 might be used as a marker for identifying patients who will benefit from PLK1 inhibitor treatment.
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Affiliation(s)
- Riet van der Meer
- Authors' Affiliations: Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee; and Department of Radiation Oncology, Northwestern Feinberg School of Medicine, Chicago, Illinois
| | - Ha Yong Song
- Authors' Affiliations: Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee; and Department of Radiation Oncology, Northwestern Feinberg School of Medicine, Chicago, Illinois
| | - Seong-Hoon Park
- Authors' Affiliations: Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee; and Department of Radiation Oncology, Northwestern Feinberg School of Medicine, Chicago, Illinois
| | - Sarki A Abdulkadir
- Authors' Affiliations: Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee; and Department of Radiation Oncology, Northwestern Feinberg School of Medicine, Chicago, Illinois
| | - Meejeon Roh
- Authors' Affiliations: Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee; and Department of Radiation Oncology, Northwestern Feinberg School of Medicine, Chicago, Illinois
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